From: Thomas Fjellstrom <tfjellstrom@shaw.ca>
To: kvm@vger.kernel.org
Subject: Re: Virtualization Performance: Intel vs. AMD
Date: Sun, 15 Nov 2009 10:54:57 -0700 [thread overview]
Message-ID: <200911151054.57510.tfjellstrom@shaw.ca> (raw)
In-Reply-To: <7AEAE1FABF3C4D1DA1F380583F68EAFE@neilhp>
On Sun November 15 2009, Neil Aggarwal wrote:
> > The Core i7 has hyperthreading, so you see 8 logical CPUs.
>
> Are you saying the AMD processors do not have hyperthreading?
Course not. Hyperthreading is dubious at best.
> I have a machine with two six-core AMD Opterons.
> top shows me 12 logical CPUs.
If it had Hyperthreading, you'd see 24 logical cpus.
6 + 6 == 12 * 2(ht) == 24.
Those six cores in each cpu are actual physcial cores. Not fake logical
cores.
> Neil
>
>
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--
Thomas Fjellstrom
tfjellstrom@shaw.ca
next prev parent reply other threads:[~2009-11-15 17:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-15 12:22 Virtualization Performance: Intel vs. AMD Andreas Winkelbauer
2009-11-15 13:05 ` Neil Aggarwal
2009-11-15 15:55 ` Thomas Treutner
2009-11-16 10:12 ` Avi Kivity
2009-11-17 10:23 ` Thomas Treutner
2009-11-15 15:56 ` Thomas Treutner
2009-11-15 17:33 ` Neil Aggarwal
2009-11-15 17:54 ` Thomas Fjellstrom [this message]
2009-11-15 17:59 ` Neil Aggarwal
2009-11-15 22:29 ` Gordan Bobic
2009-11-15 23:03 ` Thomas Fjellstrom
2009-11-15 23:50 ` Gordan Bobic
2009-11-16 12:02 ` Andi Kleen
2009-11-16 12:10 ` Avi Kivity
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