From: John P. L. <jo...@ho...> - 2003-06-26 13:28:58
|
Just wondering; are there any advantages or caveats about running UML on Opteron-SMP ? Just thinking that 64bit is perfect for something that uses a lot of RAM.... John |
From: Net L. <net...@li...> - 2003-06-26 13:43:02
|
On Thu, 26 Jun 2003, John P. Looney wrote: > > Just wondering; are there any advantages or caveats about running UML > on Opteron-SMP ? Just thinking that 64bit is perfect for something that > uses a lot of RAM.... What uses alot of RAM?? -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Lonni J Friedman net...@li... Linux Step-by-step & TyGeMo http://netllama.ipfox.com |
From: John P. L. <jo...@ho...> - 2003-06-26 13:58:31
|
On Thu, 2003-06-26 at 14:42, Net Llama! wrote: > On Thu, 26 Jun 2003, John P. Looney wrote: > > Just wondering; are there any advantages or caveats about running UML > > on Opteron-SMP ? Just thinking that 64bit is perfect for something that > > uses a lot of RAM.... > What uses alot of RAM?? Thirty 256MB UML instances ? John |
From: Net L. <net...@li...> - 2003-06-26 14:03:12
|
On Thu, 26 Jun 2003, John P. Looney wrote: > On Thu, 2003-06-26 at 14:42, Net Llama! wrote: > > On Thu, 26 Jun 2003, John P. Looney wrote: > > > Just wondering; are there any advantages or caveats about running UML > > > on Opteron-SMP ? Just thinking that 64bit is perfect for something that > > > uses a lot of RAM.... > > What uses alot of RAM?? > > Thirty 256MB UML instances ? You could do that on ia32 arch too. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Lonni J Friedman net...@li... Linux Step-by-step & TyGeMo http://netllama.ipfox.com |
From: Nuno S. <nun...@vg...> - 2003-06-26 14:08:17
|
Hi! John P. Looney wrote: > Just wondering; are there any advantages or caveats about running UML > on Opteron-SMP ? Just thinking that 64bit is perfect for something that > uses a lot of RAM.... > AFAIK, opteron boxen run 32bit software unmodified, so you only need a opteron (host) kernel and you can use lots of RAM without highmem/PAE. That should boost performance if you plan to have lots of memory ungry applications. Regards, Nuno Silva > John > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: INetU > Attention Web Developers & Consultants: Become An INetU Hosting Partner. > Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission! > INetU Dedicated Managed Hosting http://www.inetu.net/partner/index.php > _______________________________________________ > User-mode-linux-user mailing list > Use...@li... > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > |
From: John P. L. <jo...@ho...> - 2003-06-26 14:46:06
|
On Thu, 2003-06-26 at 15:09, Nuno Silva wrote: > AFAIK, opteron boxen run 32bit software unmodified, so you only need a > opteron (host) kernel and you can use lots of RAM without highmem/PAE. > That should boost performance if you plan to have lots of memory ungry > applications. If you had UMLs compiled for opteron, they could make use of the new extended instruction set that gets you 30% (allegedly) speed up. Ah, I'll get one, and try it :) John |
From: Nuno S. <nun...@vg...> - 2003-06-26 15:13:40
|
John P. Looney wrote: > On Thu, 2003-06-26 at 15:09, Nuno Silva wrote: > >>AFAIK, opteron boxen run 32bit software unmodified, so you only need a >>opteron (host) kernel and you can use lots of RAM without highmem/PAE. >>That should boost performance if you plan to have lots of memory ungry >>applications. > > > If you had UMLs compiled for opteron, they could make use of the new > extended instruction set that gets you 30% (allegedly) speed up. I think you only need to add -m64 to CFLAGS and recompile UML. But I don't have such a box to try it out... > > Ah, I'll get one, and try it :) > Please do! And report back! :) Regards, Nuno Silva > John > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: INetU > Attention Web Developers & Consultants: Become An INetU Hosting Partner. > Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission! > INetU Dedicated Managed Hosting http://www.inetu.net/partner/index.php > _______________________________________________ > User-mode-linux-user mailing list > Use...@li... > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user > |
From: Debreczeni P. <da...@tv...> - 2003-10-27 11:12:12
|
Hello! Did u try? Other? If yes please share your information. Thx Dante Nuno Silva wrote: > > > John P. Looney wrote: > >> On Thu, 2003-06-26 at 15:09, Nuno Silva wrote: >> >>> AFAIK, opteron boxen run 32bit software unmodified, so you only need >>> a opteron (host) kernel and you can use lots of RAM without >>> highmem/PAE. That should boost performance if you plan to have lots >>> of memory ungry applications. >> >> >> >> If you had UMLs compiled for opteron, they could make use of the new >> extended instruction set that gets you 30% (allegedly) speed up. > > > > I think you only need to add -m64 to CFLAGS and recompile UML. But I > don't have such a box to try it out... > >> >> Ah, I'll get one, and try it :) >> > > Please do! And report back! :) > > Regards, > Nuno Silva > > >> John >> > |
From: Debreczeni P. <da...@tv...> - 2003-11-04 12:23:16
|
I tried but failed to compile kernel with x86_64 arch and uml :( Nobody use uml with opteron? Dante John P. Looney wrote: > On Mon, 2003-10-27 at 10:58, Debreczeni Peter wrote: > >>Hello! >> >>Did u try? Other? >>If yes please share your information. > > > No, not yet. > > John |
From: Bryan O'S. <bo...@se...> - 2003-11-04 17:58:20
|
On Tue, 2003-11-04 at 04:17, Debreczeni Peter wrote: > I tried but failed to compile kernel with x86_64 arch and uml :( > Nobody use uml with opteron? Jeff is working on a port at the moment, which my company is sponsoring. There will be more news when it's closer to ready. Until then, you'll have to live with 32-bit UML on Opteron, which already works fine. <b |
From: Debreczeni P. <da...@tv...> - 2003-11-05 14:05:45
|
nice, then i wait I have another problem with uml on kernel 2.4.22 using uml-patch-2.4.22-5. when i compile kernel with smp an error occure without smp everything works fine thx Dante Bryan O'Sullivan wrote: > On Tue, 2003-11-04 at 04:17, Debreczeni Peter wrote: > >>I tried but failed to compile kernel with x86_64 arch and uml :( >>Nobody use uml with opteron? > > > Jeff is working on a port at the moment, which my company is > sponsoring. There will be more news when it's closer to ready. > > Until then, you'll have to live with 32-bit UML on Opteron, which > already works fine. > > <b |
From: Bryan O'S. <bo...@se...> - 2003-06-26 16:03:24
|
On Thu, 2003-06-26 at 07:45, John P. Looney wrote: > If you had UMLs compiled for opteron, they could make use of the new > extended instruction set that gets you 30% (allegedly) speed up. UML hasn't been ported to Opteron yet, and gcc doesn't emit the extended instructions for ia32. <b |
From: John P. L. <jo...@ho...> - 2003-06-26 14:43:59
|
On Thu, 2003-06-26 at 15:03, Net Llama! wrote: > On Thu, 26 Jun 2003, John P. Looney wrote: > > > On Thu, 2003-06-26 at 14:42, Net Llama! wrote: > > > On Thu, 26 Jun 2003, John P. Looney wrote: > > > > Just wondering; are there any advantages or caveats about running UML > > > > on Opteron-SMP ? Just thinking that 64bit is perfect for something that > > > > uses a lot of RAM.... > > > What uses alot of RAM?? > > > > Thirty 256MB UML instances ? > > You could do that on ia32 arch too. Not really. It's a hack. You get an extra layer of page table indirection (you end up losing about half a gig on a four gig machine, just looking after RAM); a page fault causes three page lookups, rather than two. You have higher memory latencies. Context switches take much longer. It's Just Not Right. John |
From: Net L. <net...@li...> - 2003-06-26 15:44:26
|
On Thu, 26 Jun 2003, John P. Looney wrote: > On Thu, 2003-06-26 at 15:03, Net Llama! wrote: > > On Thu, 26 Jun 2003, John P. Looney wrote: > > > > > On Thu, 2003-06-26 at 14:42, Net Llama! wrote: > > > > On Thu, 26 Jun 2003, John P. Looney wrote: > > > > > Just wondering; are there any advantages or caveats about running UML > > > > > on Opteron-SMP ? Just thinking that 64bit is perfect for something that > > > > > uses a lot of RAM.... > > > > What uses alot of RAM?? > > > > > > Thirty 256MB UML instances ? > > > > You could do that on ia32 arch too. > > Not really. It's a hack. You get an extra layer of page table > indirection (you end up losing about half a gig on a four gig machine, > just looking after RAM); a page fault causes three page lookups, rather > than two. You have higher memory latencies. Context switches take much > longer. It's Just Not Right. Yea, its not perfect, but it works well enough for my purposes. I've got two boxes running 8GB & 16GB, and UML works well enough on them. Its certainly cheaper than spending the money on brand new opteron boxes. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Lonni J Friedman net...@li... Linux Step-by-step & TyGeMo http://netllama.ipfox.com |