linux-kernel - Re: [patch 1/4] x86: FIFO ticket spinlocks

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Message-ID: <472BC74E.9090505@redhat.com>
Date:	Fri, 02 Nov 2007 20:56:46 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Nick Piggin <npiggin@...e.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 1/4] x86: FIFO ticket spinlocks

On 11/02/2007 07:01 PM, Nick Piggin wrote:
> 
> In the contended multi-threaded tight loop, the xchg lock is slower than inc
> lock but still beats the fair xadd lock, but that's only because it is
> just as unfair if not more so on this hardware (runtime difference of up to
> about 10%)
> 

I meant xchg for unlock, not lock.

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