linux-kernel - Re: [rfc][patch 2/2] x86

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Message-ID: <20070716092435.GB21464@wotan.suse.de>
Date:	Mon, 16 Jul 2007 11:24:35 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andi Kleen <ak@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [rfc][patch 2/2] x86_64: FIFO ticket spinlocks

On Mon, Jul 16, 2007 at 10:16:54AM +0100, Alan Cox wrote:
> > however the difference is quite small on Core2 and Opteron when working out of
> > cache, and becomes almost insignificant even on P4 when the lock misses cache.
> > trylock is more significantly slower, but they are relatively rare.
> 
> This has a 255 processor limit (worst case). That should probably be
> clearly documented for the future.

Yeah good point. I added an #error for it.
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