linux-kernel - Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks

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Message-ID: <4E8DEED0.1020909@goop.org>
Date:	Thu, 06 Oct 2011 11:09:20 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Stephan Diestelhorst <stephan.diestelhorst@....com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Jan Beulich <JBeulich@...e.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nick Piggin <npiggin@...nel.dk>,
	the arch/x86 maintainers <x86@...nel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks

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.

    J
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