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From: Vern <ve...@cw...> - 2005-10-21 19:17:45
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I am having troubles rebooting my system. Can anyone tell me what the dif= ference is between:=A0 * Core (2.6.12-1.1378_FC3smp) and=20 * Fedora Core (2.6.12-1.1378_FC3) When I reboot my system and I try to go into any of the kernals that have= smp on them I can never get back up. It seems that when it gets to the P= roFTP server starting I get a bunch of crap on the screen like traffic an= d it never gets past that. But if I boot without the smp it goes in. Vern =20 |
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From: John H. <web...@ew...> - 2005-10-21 19:36:09
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Vern wrote: > I am having troubles rebooting my system. Can anyone tell me what the > difference is between: > > * Core (2.6.12-1.1378_FC3smp) and > * Fedora Core (2.6.12-1.1378_FC3) > > When I reboot my system and I try to go into any of the kernals that > have smp on them I can never get back up. It seems that when it gets > to the ProFTP server starting I get a bunch of crap on the screen like > traffic and it never gets past that. But if I boot without the smp it > goes in. > > Vern > > !DSPAM:43593f71257901268242711! In grub, under kernel options, try ro root=LABEL=/ apm=off noapic rhgb quiet That fixed it for me on kernel 2.6.9-22.ELsmp running CentOS 4.2. There's lots of flags available for boot up options. Mine died much earlier in the boot.. just after expanding kernel or some such. If you do think it is traffic, you could unplug the network cable to see if it is external. Good luck! John Hinton |
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From: Vern <ve...@cw...> - 2005-10-21 19:40:57
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Sorry I don't understand what you are saying. Where is the problem, why w= ould I have this problem? Why does it work on the kernals labeled without= smp? What is the difference? ---------- Original Message ----------- From: John Hinton <web...@ew...>=20 To: web...@li...=20 Sent: Fri, 21 Oct 2005 15:35:16 -0400=20 Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues > Vern wrote:=20 >=20 > > I am having troubles rebooting my system. Can anyone tell me what the= =20 > > difference is between:=20 > >=20 > > =A0 =A0 * Core (2.6.12-1.1378_FC3smp) and=20 > > =A0 =A0 * Fedora Core (2.6.12-1.1378_FC3)=20 > >=20 > > When I reboot my system and I try to go into any of the kernals that=20 > > have smp on them I can never get back up. It seems that when it gets=20 > > to the ProFTP server starting I get a bunch of crap on the screen lik= e=20 > > traffic and it never gets past that. But if I boot without the smp it= =20 > > goes in.=20 > >=20 > > Vern=20 > >=20 > > !DSPAM:43593f71257901268242711!=20 >=20 > In grub, under kernel options, try=20 >=20 > ro root=3DLABEL=3D/ apm=3Doff noapic rhgb quiet=20 >=20 > That fixed it for me on kernel 2.6.9-22.ELsmp running CentOS 4.2.=20 >=20 > There's lots of flags available for boot up options. Mine died much=20 > earlier in the boot.. just after expanding kernel or some such. If you=20 > do think it is traffic, you could unplug the network cable to see if it= =20 > is external.=20 >=20 > Good luck!=20 >=20 > John Hinton=20 >=20 > -------------------------------------------------------=20 > This SF.Net email is sponsored by:=20 > Power Architecture Resource Center: Free content, downloads, discussion= s,=20 > and more. http://solutions.newsforge.com/ibmarch.tmpl=20 > -=20 > Forwarded by the Webmin mailing list at web...@li...= .net=20 > To remove yourself from this list, go to=20 > http://lists.sourceforge.net/lists/listinfo/webadmin-list=20 ------- End of Original Message ------- =20 |
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From: Vern <ve...@cw...> - 2005-10-21 20:02:52
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In case anyone is interested it has to do multiprocessing which I don't e= ven have so=20 disabling it does nothing. It's been working for over a year and all of a= sudden...=20 sometimes I hate computers! Anyway, that is resolved. ---------- Original Message -----------=20 From: John Hinton <web...@ew...>=20 To: web...@li...=20 Sent: Fri, 21 Oct 2005 15:35:16 -0400=20 Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues > Vern wrote:=20 >=20 > > I am having troubles rebooting my system. Can anyone tell me what the= =20 > > difference is between:=20 > >=20 > > =A0 =A0 * Core (2.6.12-1.1378_FC3smp) and=20 > > =A0 =A0 * Fedora Core (2.6.12-1.1378_FC3)=20 > >=20 > > When I reboot my system and I try to go into any of the kernals that=20 > > have smp on them I can never get back up. It seems that when it gets=20 > > to the ProFTP server starting I get a bunch of crap on the screen lik= e=20 > > traffic and it never gets past that. But if I boot without the smp it= =20 > > goes in.=20 > >=20 > > Vern=20 > >=20 > > !DSPAM:43593f71257901268242711!=20 >=20 > In grub, under kernel options, try=20 >=20 > ro root=3DLABEL=3D/ apm=3Doff noapic rhgb quiet=20 >=20 > That fixed it for me on kernel 2.6.9-22.ELsmp running CentOS 4.2.=20 >=20 > There's lots of flags available for boot up options. Mine died much=20 > earlier in the boot.. just after expanding kernel or some such. If you=20 > do think it is traffic, you could unplug the network cable to see if it= =20 > is external.=20 >=20 > Good luck!=20 >=20 > John Hinton=20 >=20 > -------------------------------------------------------=20 > This SF.Net email is sponsored by:=20 > Power Architecture Resource Center: Free content, downloads, discussion= s,=20 > and more. http://solutions.newsforge.com/ibmarch.tmpl=20 > -=20 > Forwarded by the Webmin mailing list at web...@li...= .net=20 > To remove yourself from this list, go to=20 > http://lists.sourceforge.net/lists/listinfo/webadmin-list=20 ------- End of Original Message ------- |
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From: John H. <web...@ew...> - 2005-10-21 20:22:41
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Vern wrote: >In case anyone is interested it has to do multiprocessing which I don't even have so >disabling it does nothing. It's been working for over a year and all of a sudden... >sometimes I hate computers! Anyway, that is resolved. > > Ahh.. OK.. so Fedora 'thought' it found a second processor which you do not have. Seems this is happening on several particular systems lately. The smp of course stands for multi-processor. Set grub (or lilo if you're using that) to boot from the Fedora Core (2.6.12-1.1378_FC3) kernel. Then, under software packages, search for kernel and remove any kernels with the smp. I don't know exactly why this is happening. File a bug report on the Fedora site. Things are getting more complicated in the Linux world. Seems there is a move to support just about everything that comes along and that's not an easy undertaking. At the same time, older hardware 'work-arounds' seem to be getting dumped from things like Anaconda. I think we've been from the almost nothing is supported era of the early 90s, to the almost anything works era of the 00s and are moving into the time when moving forward is also moving backwards with regards to hardware. The pendulum swings! John Hinton > >---------- Original Message ----------- >From: John Hinton <web...@ew...> >To: web...@li... >Sent: Fri, 21 Oct 2005 15:35:16 -0400 >Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues > > > >>Vern wrote: >> >> >> >>>I am having troubles rebooting my system. Can anyone tell me what the >>>difference is between: >>> >>> * Core (2.6.12-1.1378_FC3smp) and >>> * Fedora Core (2.6.12-1.1378_FC3) >>> >>>When I reboot my system and I try to go into any of the kernals that >>>have smp on them I can never get back up. It seems that when it gets >>>to the ProFTP server starting I get a bunch of crap on the screen like >>>traffic and it never gets past that. But if I boot without the smp it >>>goes in. >>> >>>Vern >>> >>> >>> >>> >>In grub, under kernel options, try >> >>ro root=LABEL=/ apm=off noapic rhgb quiet >> >>That fixed it for me on kernel 2.6.9-22.ELsmp running CentOS 4.2. >> >>There's lots of flags available for boot up options. Mine died much >>earlier in the boot.. just after expanding kernel or some such. If you >>do think it is traffic, you could unplug the network cable to see if it >>is external. >> >>Good luck! >> >>John Hinton >> >>------------------------------------------------------- >>This SF.Net email is sponsored by: >>Power Architecture Resource Center: Free content, downloads, discussions, >>and more. http://solutions.newsforge.com/ibmarch.tmpl >>- >>Forwarded by the Webmin mailing list at web...@li... >>To remove yourself from this list, go to >>http://lists.sourceforge.net/lists/listinfo/webadmin-list >> >> >------- End of Original Message ------- > > > >------------------------------------------------------- >This SF.Net email is sponsored by: >Power Architecture Resource Center: Free content, downloads, discussions, >and more. http://solutions.newsforge.com/ibmarch.tmpl >- >Forwarded by the Webmin mailing list at web...@li... >To remove yourself from this list, go to >http://lists.sourceforge.net/lists/listinfo/webadmin-list > > >!DSPAM:435949f8309161394027713! > > > |
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From: Vernon J. S. <ve...@ve...> - 2005-10-21 20:50:39
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You can still use smp under a single processor. At times it can help manage the load of the server. ------------------------------------------ Vernon J. Spangler http://www.vernonspangler.org/ (573) 221-5193 Home (573) 795-4217 Cell ve...@ve... ------------------------------------------ Powered by Windows XP Professional Sent by Microsoft Outlook 2003 -----Original Message----- From: John Hinton [mailto:web...@ew...] Sent: Friday, October 21, 2005 2:22 PM To: web...@li... Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues Vern wrote: >In case anyone is interested it has to do multiprocessing which I don't even have so >disabling it does nothing. It's been working for over a year and all of a sudden... >sometimes I hate computers! Anyway, that is resolved. > > Ahh.. OK.. so Fedora 'thought' it found a second processor which you do not have. Seems this is happening on several particular systems lately. The smp of course stands for multi-processor. Set grub (or lilo if you're using that) to boot from the Fedora Core (2.6.12-1.1378_FC3) kernel. Then, under software packages, search for kernel and remove any kernels with the smp. I don't know exactly why this is happening. File a bug report on the Fedora site. Things are getting more complicated in the Linux world. Seems there is a move to support just about everything that comes along and that's not an easy undertaking. At the same time, older hardware 'work-arounds' seem to be getting dumped from things like Anaconda. I think we've been from the almost nothing is supported era of the early 90s, to the almost anything works era of the 00s and are moving into the time when moving forward is also moving backwards with regards to hardware. The pendulum swings! John Hinton > >---------- Original Message ----------- >From: John Hinton <web...@ew...> >To: web...@li... >Sent: Fri, 21 Oct 2005 15:35:16 -0400 >Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues > > > >>Vern wrote: >> >> >> >>>I am having troubles rebooting my system. Can anyone tell me what the >>>difference is between: >>> >>> * Core (2.6.12-1.1378_FC3smp) and >>> * Fedora Core (2.6.12-1.1378_FC3) >>> >>>When I reboot my system and I try to go into any of the kernals that >>>have smp on them I can never get back up. It seems that when it gets >>>to the ProFTP server starting I get a bunch of crap on the screen like >>>traffic and it never gets past that. But if I boot without the smp it >>>goes in. >>> >>>Vern >>> >>> >>> >>> >>In grub, under kernel options, try >> >>ro root=LABEL=/ apm=off noapic rhgb quiet >> >>That fixed it for me on kernel 2.6.9-22.ELsmp running CentOS 4.2. >> >>There's lots of flags available for boot up options. Mine died much >>earlier in the boot.. just after expanding kernel or some such. If you >>do think it is traffic, you could unplug the network cable to see if it >>is external. >> >>Good luck! >> >>John Hinton >> >>------------------------------------------------------- >>This SF.Net email is sponsored by: >>Power Architecture Resource Center: Free content, downloads, discussions, >>and more. http://solutions.newsforge.com/ibmarch.tmpl >>- >>Forwarded by the Webmin mailing list at web...@li... >>To remove yourself from this list, go to >>http://lists.sourceforge.net/lists/listinfo/webadmin-list >> >> >------- End of Original Message ------- > > > >------------------------------------------------------- >This SF.Net email is sponsored by: >Power Architecture Resource Center: Free content, downloads, discussions, >and more. http://solutions.newsforge.com/ibmarch.tmpl >- >Forwarded by the Webmin mailing list at web...@li... >To remove yourself from this list, go to >http://lists.sourceforge.net/lists/listinfo/webadmin-list > > >!DSPAM:435949f8309161394027713! > > > ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl - Forwarded by the Webmin mailing list at web...@li... To remove yourself from this list, go to http://lists.sourceforge.net/lists/listinfo/webadmin-list |
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From: John H. <web...@ew...> - 2005-10-21 21:00:50
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Vernon J. Spangler wrote: >You can still use smp under a single processor. At times it can help manage >the load of the server. > > > OH WOW!! That's news to me. Do you by any chance have a good reference site on the issue? All I've heard so far is people complaing about this "error", which now sounds like it might not be an error. John Hinton |
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From: Vern <ve...@cw...> - 2005-10-21 21:11:51
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This is where I found out about it: http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/install-guide/s1-x8= 6- bootloader.html ---------- Original Message -----------=20 From: John Hinton <web...@ew...>=20 To: web...@li...=20 Sent: Fri, 21 Oct 2005 16:59:55 -0400=20 Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues > Vernon J. Spangler wrote:=20 >=20 > >You can still use smp under a single processor. At times it can help m= anage=20 > >the load of the server.=20 > >=20 > > =A0=20 > >=20 > OH WOW!! That's news to me. Do you by any chance have a good reference=20 > site on the issue? All I've heard so far is people complaing about this= =20 > "error", which now sounds like it might not be an error.=20 >=20 > John Hinton=20 >=20 > -------------------------------------------------------=20 > This SF.Net email is sponsored by:=20 > Power Architecture Resource Center: Free content, downloads, discussion= s,=20 > and more. http://solutions.newsforge.com/ibmarch.tmpl=20 > -=20 > Forwarded by the Webmin mailing list at web...@li...= .net=20 > To remove yourself from this list, go to=20 > http://lists.sourceforge.net/lists/listinfo/webadmin-list=20 ------- End of Original Message ------- |
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From: Alan D. <We...@Om...> - 2005-10-21 21:25:02
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The Red Hat document doesn't state anything about running an SMP kernel on a single processor system, and I'm not sure what you mean about it helping manage the load of the server, unless you are referring to hyperthreading, which is a different issue. However, Google turned up a pertinent message from the Linux kernel list back in 1999: http://www.ussg.iu.edu/hypermail/linux/kernel/9911.3/0283.html BTW, "UP" refers to "uni-processor" (the opposite of multi-processor), in other words a computer with only one processor, or a kernel that does not support SMP. Here's another interesting thread from the FreeBSD list, which also refers to Linux and Windows: http://groups.google.com/group/comp.unix.bsd.freebsd.misc/browse_thread/thread/faa4f649f0704183/3c57b22b4d8ae8b8 Alan On 10/21/2005 5:11 PM, Vern wrote: > This is where I found out about it: > > http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/install-guide/s1-x86-bootloader.html > > ---------- Original Message ----------- > From: John Hinton <web...@ew...> > To: web...@li... > Sent: Fri, 21 Oct 2005 16:59:55 -0400 > Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues > > >> Vernon J. Spangler wrote: >> >> >>> You can still use smp under a single processor. At times it can help manage >>> the load of the server. >> OH WOW!! That's news to me. Do you by any chance have a good reference >> site on the issue? All I've heard so far is people complaing about this >> "error", which now sounds like it might not be an error. >> >> John Hinton |
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From: John H. <web...@ew...> - 2005-10-21 22:12:52
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Vern wrote: >This is where I found out about it: > >http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/install-guide/s1-x= 86- >bootloader.html > > =20 > OK, from RedHat -------- 3.20.4. SMP Motherboards, GRUB, and LILO This section is specific to SMP motherboards only. SMP, short for=20 Symmetric Multiprocessing, is a computer architecture providing fast=20 performance by making multiple CPUs available to complete individual=20 processes simultaneously (multiprocessing). If the installation program detects an SMP motherboard on your system,=20 it will automatically create two boot loader entries. Note *Note* =09 Intel=AE Pentium=AE 4 systems with hyperthreading will have an SMP kernel= =20 installed by default. The two GRUB entries will be Red Hat Linux (/kernel version/) and Red=20 Hat Linux (/kernel version/-smp). The Red Hat Linux (/kernel=20 version/-smp) will boot by default. However, if you have trouble with=20 the SMP kernel, you can elect to boot the Red Hat Linux (/kernel=20 version/) entry instead. You will retain all the functionality as=20 before, but you will only be operating with a single processor. The two LILO entries will be linux and linux-up. The linux entry will=20 boot by default. However, if you have trouble with the SMP kernel, you=20 can elect to boot the linux-up entry instead. You will retain all the=20 functionality as before, but you will only be operating with a single=20 processor. ------------------------ So, as I read this, and maybe it might work (or at least the machine=20 might start) on other systems, but all I see is "Pentium 4 with=20 hyperthreading" as an exception. The original poster didn't say a word=20 about what his hardware situation was. I was trying to read minds and=20 didn't know about this processor's special properties. All I have known before today, was just like this from wikipedia.org ------------------- *Symmetric Multiprocessing*, or *SMP*, is a multiprocessor=20 <http://en.wikipedia.org/wiki/Multiprocessor> computer architecture=20 where two or more identical processors are connected to a single shared=20 main memory <http://en.wikipedia.org/wiki/Main_memory>. Most common=20 multiprocessor systems today use an SMP architecture. ---------------------- John Hinton |
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From: <dhu...@we...> - 2005-10-21 21:21:29
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John Hinton wrote: > <...snip> > OH WOW!! That's news to me. Do you by any chance have a good reference > site on the issue? <...snip> > John Hinton ...no 'reference' but (by accident ;-) ) by lazyness, here is definitely a single-processor system running with an (SuSE) SMP-Kernel 8-) ?-) NOT that I would say that there are any (kind of) performance-/load- issues --> it's just running.... -- greetings Dieter Huerten |
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From: Vernon J. S. <ve...@ve...> - 2005-10-21 21:27:48
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Here is the thing that I have learned years ago when working with smp verses a standard kernel. When you get the new kernels you need to select the smp first after the reboot. When you get the new kernels they comply everthing needed as if it was a fresh boot. If you switch from a single to a multi then you are going to have errors and it will not boot. If you go from a multi to a single you are going to get it to boot but some programs will not work. Somewhat of a catch 22 if you know what I mean. But any less you can run a single cpu system with a smp kernel as long as when you first get the kernel version that that it is a new version than the current one you are using. Same kernel version swapping is going to have problems on a single cpu system unless you specify the new kernel first being a smp. If this doesn't make sense let me know, but under the RHCE/RHCT it can be done. There are just rules (instructions) on how to make it work. ------------------------------------------ Vernon J. Spangler http://www.vernonspangler.org/ (573) 221-5193 Home (573) 795-4217 Cell ve...@ve... ------------------------------------------ Powered by Windows XP Professional Sent by Microsoft Outlook 2003 -----Original Message----- From: Vernon J. Spangler [mailto:ve...@ve...] Sent: Friday, October 21, 2005 3:58 PM To: web...@li... Subject: RE: [webmin-l] Urgent Help Needed - Kernel Issues You can still use smp under a single processor. At times it can help manage the load of the server. ------------------------------------------ Vernon J. Spangler http://www.vernonspangler.org/ (573) 221-5193 Home (573) 795-4217 Cell ve...@ve... ------------------------------------------ Powered by Windows XP Professional Sent by Microsoft Outlook 2003 -----Original Message----- From: John Hinton [mailto:web...@ew...] Sent: Friday, October 21, 2005 2:22 PM To: web...@li... Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues Vern wrote: >In case anyone is interested it has to do multiprocessing which I don't even have so >disabling it does nothing. It's been working for over a year and all of a sudden... >sometimes I hate computers! Anyway, that is resolved. > > Ahh.. OK.. so Fedora 'thought' it found a second processor which you do not have. Seems this is happening on several particular systems lately. The smp of course stands for multi-processor. Set grub (or lilo if you're using that) to boot from the Fedora Core (2.6.12-1.1378_FC3) kernel. Then, under software packages, search for kernel and remove any kernels with the smp. I don't know exactly why this is happening. File a bug report on the Fedora site. Things are getting more complicated in the Linux world. Seems there is a move to support just about everything that comes along and that's not an easy undertaking. At the same time, older hardware 'work-arounds' seem to be getting dumped from things like Anaconda. I think we've been from the almost nothing is supported era of the early 90s, to the almost anything works era of the 00s and are moving into the time when moving forward is also moving backwards with regards to hardware. The pendulum swings! John Hinton > >---------- Original Message ----------- >From: John Hinton <web...@ew...> >To: web...@li... >Sent: Fri, 21 Oct 2005 15:35:16 -0400 >Subject: Re: [webmin-l] Urgent Help Needed - Kernel Issues > > > >>Vern wrote: >> >> >> >>>I am having troubles rebooting my system. Can anyone tell me what the >>>difference is between: >>> >>> * Core (2.6.12-1.1378_FC3smp) and >>> * Fedora Core (2.6.12-1.1378_FC3) >>> >>>When I reboot my system and I try to go into any of the kernals that >>>have smp on them I can never get back up. It seems that when it gets >>>to the ProFTP server starting I get a bunch of crap on the screen like >>>traffic and it never gets past that. But if I boot without the smp it >>>goes in. >>> >>>Vern >>> >>> >>> >>> >>In grub, under kernel options, try >> >>ro root=LABEL=/ apm=off noapic rhgb quiet >> >>That fixed it for me on kernel 2.6.9-22.ELsmp running CentOS 4.2. >> >>There's lots of flags available for boot up options. Mine died much >>earlier in the boot.. just after expanding kernel or some such. If you >>do think it is traffic, you could unplug the network cable to see if it >>is external. >> >>Good luck! >> >>John Hinton >> >>------------------------------------------------------- >>This SF.Net email is sponsored by: >>Power Architecture Resource Center: Free content, downloads, discussions, >>and more. http://solutions.newsforge.com/ibmarch.tmpl >>- >>Forwarded by the Webmin mailing list at web...@li... >>To remove yourself from this list, go to >>http://lists.sourceforge.net/lists/listinfo/webadmin-list >> >> >------- End of Original Message ------- > > > >------------------------------------------------------- >This SF.Net email is sponsored by: >Power Architecture Resource Center: Free content, downloads, discussions, >and more. http://solutions.newsforge.com/ibmarch.tmpl >- >Forwarded by the Webmin mailing list at web...@li... >To remove yourself from this list, go to >http://lists.sourceforge.net/lists/listinfo/webadmin-list > > >!DSPAM:435949f8309161394027713! > > > ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl - Forwarded by the Webmin mailing list at web...@li... To remove yourself from this list, go to http://lists.sourceforge.net/lists/listinfo/webadmin-list ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl - Forwarded by the Webmin mailing list at web...@li... To remove yourself from this list, go to http://lists.sourceforge.net/lists/listinfo/webadmin-list |
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From: Barry <we...@i1...> - 2005-10-21 22:17:23
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I had a similar issue the past week or so where my system suddenly;y was hanging. First I thought is was overheating due to heavy load. But careful observation told me that wasn't it. This chi a FC4 system btw. Eventually I concluded that yum had updated the kernel RPMs when I did full updates. There were 4 kernels on my system under /boot. As I wasn't really sure when it started getting flaky (I suspect the last 2, but the 2nd one I am not sure of) I edited my grub.conf file to force the original kernel to boot. All seems OK the last 4 days or so, including under heavy CPU load, where before it might stay up an hour to a day or so, I never suspected a SMP problem - sheesh, is that another thing to worry about? kernel updates always make me nervous anyway....is there a way to tell yum to not update the kernel unless specifically told to? Best, Barry |
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From: John H. <web...@ew...> - 2005-10-21 22:41:08
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Barry wrote:
> I had a similar issue the past week or so where my system suddenly;y
> was hanging. First I thought is was overheating due to heavy load. But
> careful observation told me that wasn't it.
>
> This chi a FC4 system btw.
>
> Eventually I concluded that yum had updated the kernel RPMs when I did
> full updates. There were 4 kernels on my system under /boot. As I
> wasn't really sure when it started getting flaky (I suspect the last
> 2, but the 2nd one I am not sure of) I edited my grub.conf file to
> force the original kernel to boot. All seems OK the last 4 days or so,
> including under heavy CPU load, where before it might stay up an hour
> to a day or so,
>
> I never suspected a SMP problem - sheesh, is that another thing to
> worry about? kernel updates always make me nervous anyway....is there
> a way to tell yum to not update the kernel unless specifically told to?
from man yum
--exclude=package
Exclude a specific package by name or glob from updates on
all repositories.
Configuration Option: exclude
I would think that in /etc/yum.conf an entry on a separate line such as
exclude=kernel
would do the trick.
John Hinton
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From: Joe C. <jo...@sw...> - 2005-10-22 08:54:49
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> Vern wrote: > >> In case anyone is interested it has to do multiprocessing which I >> don't even have so disabling it does nothing. It's been working for >> over a year and all of a sudden... sometimes I hate computers! Anyway, >> that is resolved. I'll add a few minor bits of info to this thread: P4 processors over 3.0 GHz, P4-based Xeon processors (and not the older PIII-based Xeons), and a few other Intel processors have a feature called hyper-threading. This is treated by Linux as an additional processor and so if you have one of those processors, Linux will treat it as a dual processor SMP machine if you boot into an SMP kernel. This isn't a bug, it's a feature, and increases performance by a small amount for some types of task (primarily tasks that require multiple simultaneous processes rather than a very demanding single process task--a server with a database-backed website would see an improvement while a Squid caching proxy server would lose performance). That's not to say there aren't some systems that might get misdetected as multi-CPU when they don't have hyperthreading or additional physical CPUs, but I'm not aware of any that do. It would be a bug for a non-hyperthread cabable single-core single-CPU system to be detected as SMP-capable. Intel has an overview of hyper-threading, including a specific list of processors that have this feature, here: http://www.intel.com/technology/hyperthread/ An SMP kernel should operate on a single CPU machine without disatrous consequences. Performance will likely suffer, as there is additional overhead in an SMP system due to the additional locking required to have more than one CPU share a single pool of memory. If you find instability when running an SMP kernel on a single CPU system (that is stable when run under a uniprocessor kernel), a bug report to that effect to your operating system vendor would be appropriate. But, there is also no reason to run an SMP kernel on a machine that does not have either multiple CPUs or hyper-threading. It does not improve performance (it does the opposite due to the extra locks), and increases memory usage by a small amount. Finally, kernels are way outside of the scope of the Webmin list (as clearly evidenced by the well-meaning but misleading and/or incomplete replies to this query to date). The newbie or general technical discussion list of your Linux distribution would be the place to start with a problem like this, possibly escalating to a bug report to your OS vendor. |
