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Re: [Xen-users] DomU load average much higher after hardware change

from [Paul Tomblin] [Permanent Link][Original]

To:	Dustin.Henning@xxxxxxxxxxx
Subject:	Re: [Xen-users] DomU load average much higher after hardware change
From:	Paul Tomblin <ptomblin@xxxxxxxxx>
Date:	2010年6月30日 10:08:09 -0400
Cc:	xen-users@xxxxxxxxxxxxxxxxxxx, DEMAINE Benoit-Pierre <benoit@xxxxxxxxxxxx>
Delivery-date:	2010年6月30日 07:10:00 -0700
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On Wed, Jun 30, 2010 at 9:38 AM, Dustin Henning <Dustin.Henning@xxxxxxxxxxx> wrote:

I suspect, but do not know, that the x86_64 (even if it’s called AMD64) kernel should work for 64b Xeons if Debian has one.

That is correct. The original Xeons were just i686 with more L2 cache and built in SMP. The 64 bit Xeons copied AMD's 64 bit architecture and called it "EM64T" (or "Intel 64"). Debian uses "amd64" as a catch all to refer to both amd64 and em64t. So yes, the -amd64 is the correct kernel to use on 64 bit Xeons.

References:

http://www.debian.org/doc/manuals/debian-faq/ch-compat.en.html#s-arches

"amd64: this covers systems based on AMD 64bit CPUs with AMD64 extension and all Intel CPUs with EM64T extension, and a common 64bit userspace."

http://en.wikipedia.org/wiki/Xeon

"Due to a lack of success with Intel's Itanium and Itanium 2 processors, AMD was able to introduce x86-64, a 64-bit extension to the x86 architecture. Intel followed suit by including Intel 64 (formerly EM64T; it is almost identical to AMD64) .... The Xeon was noticeably slower than AMD's Opteron, although it could be faster in situations where Hyper-Threading came into play.

--
http://www.linkedin.com/in/paultomblin
http://careers.stackoverflow.com/ptomblin

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Re: [Xen-users] DomU load average much higher after hardware change