From: Nick Piggin <npiggin@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andi Kleen <ak@suse.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [rfc][patch 2/2] x86_64: FIFO ticket spinlocks
Date: Mon, 16 Jul 2007 11:24:35 +0200 [thread overview]
Message-ID: <20070716092435.GB21464@wotan.suse.de> (raw)
In-Reply-To: <20070716101654.1c20493f@the-village.bc.nu>
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.
next prev parent reply other threads:[~2007-07-16 9:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-16 4:59 [rfc][patch 1/2] spinlock: lockbreak cleanups Nick Piggin
2007-07-16 5:01 ` [rfc][patch 2/2] x86_64: FIFO ticket spinlocks Nick Piggin
2007-07-16 9:16 ` Alan Cox
2007-07-16 9:24 ` Nick Piggin [this message]
2007-07-16 9:26 ` Ingo Molnar
2007-07-16 9:45 ` Nick Piggin
2007-07-16 9:49 ` Ingo Molnar
2007-07-16 10:18 ` Nick Piggin
2007-07-17 14:25 ` Andi Kleen
2007-07-17 15:08 ` Nick Piggin
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