Date: Tue, 4 Nov 2003 16:39:59 -0500
From: "Bill Rugolsky Jr." <brugolsky@telemetry-investments.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Paul Venezia <pvenezia@jpj.net>, linux-kernel@vger.kernel.org
Subject: Re: ext3 performance inconsistencies, 2.4/2.6
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On Tue, Nov 04, 2003 at 12:30:23PM -0800, Linus Torvalds wrote:
> But there really should be zero contention on the stdio data structures, 
> so the locking would have to be _seriously_ broken to make that kind o 
> fdifference (not necessarily buggy, but seriously badly implemented). 
> 
> A non-contended lock should be at most one locked instruction if well 
> done, both on LinuxThreads and NPTL.

The results that I just posted are also for Red Hat 9, kernel 2.4.20-20.9.

rugolsky@ti31: getconf GNU_LIBPTHREAD_VERSION
NPTL 0.34

Ulrich's release notes for nptl-0.57 says:

   The changes are numerous and most of them were made by Jakub:

   ...

   ~ better stdio locking

I don't have my laptop running Fedora handy, but that's the next thing
to test.

Regards,

	Bill Rugolsky
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