From: <se...@we...> - 2004-03-31 18:24:20
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Having quite a bit of trouble getting UML to perform properly... each time I start up a vm ti takes all the available cpu and keeps it... if I start 2 they share all the available cpu.. the result is that the cpu runs at 100% all the time... I did have these running fine earlier the only change I made was to change the rootfs to ext3, add a second partition (ext3) and install webmin..... but even going back to earlier versions without these differences I am still seeing the same cpu "hogging" what could be causing this performance grief??? been fighting with this for several days now. -sean |
From: roland <for...@gm...> - 2004-03-31 23:21:34
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if you look inside an uml (top,ps etc) - is it 100% idle? 0% usr and 0% sys, system load at 0.00 ? > I did have these running fine earlier the only change I made was to change > the rootfs to ext3, add a second partition (ext3) and install webmin..... > but even going back to earlier versions without these differences I am > still seeing the same cpu "hogging" what is "earlier versions" ? other root_fs or other kernel? or both? - uninstall/shutdown webmin and compare - revert to reiser/ext2 whatever - and compare - still hogging the cpu? check for a hacker inside you uml - maybe he installed a trojan/rootkit or similar "dirty tools" :D regards roland ----- Original Message ----- From: <se...@we...> To: <use...@li...> Sent: Wednesday, March 31, 2004 8:33 PM Subject: [uml-user] poor performance > Having quite a bit of trouble getting UML to perform properly... each time > I start up a vm ti takes all the available cpu and keeps it... if I start > 2 they share all the available cpu.. the result is that the cpu runs at > 100% all the time... > > I did have these running fine earlier the only change I made was to change > the rootfs to ext3, add a second partition (ext3) and install webmin..... > but even going back to earlier versions without these differences I am > still seeing the same cpu "hogging" > > what could be causing this performance grief??? been fighting with this for > several days now. > > -sean > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: IBM Linux Tutorials > Free Linux tutorial presented by Daniel Robbins, President and CEO of > GenToo technologies. Learn everything from fundamentals to system > administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click > _______________________________________________ > User-mode-linux-user mailing list > Use...@li... > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > |
From: tim d. <ti...@un...> - 2004-04-01 00:07:23
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vmstat 1 r b w swpd free buff cache si so bi bo in cs us sy id 0 0 0 0 339780 79832 78700 0 0 0 3 10 10 0 0 8 0 0 0 0 339780 79832 78700 0 0 0 0 105 13 0 1 99 Is it waiting on disk? (r b w = run block wait) bi= blocks of io in, bo=blocks of io out to disk. si/so are pages being swapped out. Tim roland wrote: >if you look inside an uml (top,ps etc) - is it 100% idle? >0% usr and 0% sys, system load at 0.00 ? > > > >>I did have these running fine earlier the only change I made was to change >>the rootfs to ext3, add a second partition (ext3) and install webmin..... >>but even going back to earlier versions without these differences I am >>still seeing the same cpu "hogging" >> >> >what is "earlier versions" ? >other root_fs or other kernel? or both? > >- uninstall/shutdown webmin and compare >- revert to reiser/ext2 whatever - and compare >- still hogging the cpu? check for a hacker inside you uml - maybe he installed > a trojan/rootkit or similar "dirty tools" :D > >regards >roland > > >----- Original Message ----- >From: <se...@we...> >To: <use...@li...> >Sent: Wednesday, March 31, 2004 8:33 PM >Subject: [uml-user] poor performance > > > > >>Having quite a bit of trouble getting UML to perform properly... each time >>I start up a vm ti takes all the available cpu and keeps it... if I start >>2 they share all the available cpu.. the result is that the cpu runs at >>100% all the time... >> >>I did have these running fine earlier the only change I made was to change >>the rootfs to ext3, add a second partition (ext3) and install webmin..... >>but even going back to earlier versions without these differences I am >>still seeing the same cpu "hogging" >> >>what could be causing this performance grief??? been fighting with this for >>several days now. >> >>-sean >> >> >> >>------------------------------------------------------- >>This SF.Net email is sponsored by: IBM Linux Tutorials >>Free Linux tutorial presented by Daniel Robbins, President and CEO of >>GenToo technologies. Learn everything from fundamentals to system >>administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click >>_______________________________________________ >>User-mode-linux-user mailing list >>Use...@li... >>https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user >> >> >> > > >------------------------------------------------------- >This SF.Net email is sponsored by: IBM Linux Tutorials >Free Linux tutorial presented by Daniel Robbins, President and CEO of >GenToo technologies. Learn everything from fundamentals to system >administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click >_______________________________________________ >User-mode-linux-user mailing list >Use...@li... >https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > > > -- Timothy Doyle Senior Software Engineer New Generation Media ti...@un... 707-360-1428 2455 Bennett Valley Rd. Suite C200 Santa Rosa, CA 95405 */\/\/\/\/\/\/\/\/\/\/* |
From: Simon N. <si...@pl...> - 2004-04-01 08:17:17
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Hi there I had some recent performance issues, even though I have been running a UML for a while, they didnt become apparent until I started to run more. It caused the UML's to chew CPU time, and set loads sky high.. I felt it was that the UML's were swapping all the time, but vmstat on hosts and UML's showed nothing. 1) Make sure /tmp on the host is mounted in /etc/fstab as 'tmpfs'. Heres my line: tmpfs /tmp tmpfs defaults,size=512M 0 0 2)If you build your own UML kernels, make sure that syncronous UBD access is switched on (this is a must have if you are running ext3 FS) 3)Make sure the host HDD access is set 32 but, unmaskedIRQ (hdparm /dev/<device> shows you the settings) 4)Build a host kernel with the SKAS3 patch (though I wouldnt bother with /dev/anon until the bugs with chewed FS are sorted... BTW anyone know if thats happened yet?) You could also try running each UML as its own user, then use PAM limits on the host to try and limit resource useage (or you could look into the fairsched host kernel patch). What version of host kernel are you running, and what version of UML kernel are you running? (uname -r) Kind Regards, Simon Newton, ----- Original Message ----- From: <se...@we...> To: <use...@li...> Sent: Wednesday, March 31, 2004 7:33 PM Subject: [uml-user] poor performance > Having quite a bit of trouble getting UML to perform properly... each time > I start up a vm ti takes all the available cpu and keeps it... if I start > 2 they share all the available cpu.. the result is that the cpu runs at > 100% all the time... > > I did have these running fine earlier the only change I made was to change > the rootfs to ext3, add a second partition (ext3) and install webmin..... > but even going back to earlier versions without these differences I am > still seeing the same cpu "hogging" > > what could be causing this performance grief??? been fighting with this for > several days now. > > -sean > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: IBM Linux Tutorials > Free Linux tutorial presented by Daniel Robbins, President and CEO of > GenToo technologies. Learn everything from fundamentals to system > administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click > _______________________________________________ > User-mode-linux-user mailing list > Use...@li... > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > > |