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xen-devel
Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks |
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From: |
Ingo Molnar <mingo@xxxxxxx> |
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Date: |
Mon, 10 Oct 2011 09:32:14 +0200 |
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Cc: |
Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stephan Diestelhorst <stephan.diestelhorst@xxxxxxx> |
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Mon, 10 Oct 2011 00:35:29 -0700 |
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<cover.1315878463.git.jeremy.fitzhardinge@xxxxxxxxxx> <201109282008.17722.stephan.diestelhorst@xxxxxxx> <CA+55aFwm7ESNfrHhEHrAKcjcPUq8YxtuEkJd5PzAekYo2dMYNw@xxxxxxxxxxxxxx> <2707952.s3VYcmPHUN@chlor> <4E8DE7F1.3050108@xxxxxxxx> <4E8DEED0.1020909@xxxxxxxx> |
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Mutt/1.5.21 (2010-09-15) |
* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> On 10/06/2011 10:40 AM, Jeremy Fitzhardinge wrote:
> > However, it looks like locked xadd is also has better performance: on
> > my Sandybridge laptop (2 cores, 4 threads), the add+mfence is 20% slower
> > than locked xadd, so that pretty much settles it unless you think
> > there'd be a dramatic difference on an AMD system.
>
> Konrad measures add+mfence is about 65% slower on AMD Phenom as well.
xadd also results in smaller/tighter code, right?
Thanks,
Ingo
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