From: Andi Kleen <ak@suse.de>
To: Chuck Ebbert <76306.1226@compuserve.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@suse.de>, Andrew Morton <akpm@osdl.org>,
Linus Torvalds <torvalds@osdl.org>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch 2.6.14-rc4] i386: spinlock optimization
Date: Fri, 14 Oct 2005 20:04:14 +0200 [thread overview]
Message-ID: <20051014180414.GD3502@verdi.suse.de> (raw)
In-Reply-To: <200510141350_MC3-1-ACA0-C8C9@compuserve.com>
On Fri, Oct 14, 2005 at 01:47:09PM -0400, Chuck Ebbert wrote:
> Attempt to acquire spinlock sooner after spinning and then noticing
> it has become available. Also adds a slight delay before testing the
> spinlock again when it's not available, reducing bus traffic.
I doubt your change adds any noticeable delay on a aggressive
OOO CPU, which are pretty much all modern x86s. It's probably
a nop.
-Andi
next prev parent reply other threads:[~2005-10-14 18:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-14 17:47 [patch 2.6.14-rc4] i386: spinlock optimization Chuck Ebbert
2005-10-14 18:04 ` Andi Kleen [this message]
2005-10-14 18:24 ` linux-os (Dick Johnson)
2005-10-14 18:32 ` Andrew Morton
2005-10-14 18:55 ` linux-os (Dick Johnson)
2005-10-14 18:37 ` Linus Torvalds
2005-10-14 18:56 ` linux-os (Dick Johnson)
-- strict thread matches above, loose matches on Subject: below --
2005-10-15 1:24 Chuck Ebbert
2005-10-15 15:09 ` Ingo Molnar
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