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Date:	Fri, 02 Nov 2007 20:56:46 -0400
From:	Chuck Ebbert <>
To:	Nick Piggin <>
CC:	Linus Torvalds <>,
	Linux Kernel Mailing List <>,
	Andi Kleen <>, Ingo Molnar <>
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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