From: Arjan van de Ven <arjanv@redhat.com>
To: Jens Maurer <Jens.Maurer@gmx.net>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Use x86 SSE instructions for clear_page, copy_page
Date: Tue, 17 Aug 2004 09:27:51 +0200 [thread overview]
Message-ID: <1092727670.2792.4.camel@laptop.fenrus.com> (raw)
In-Reply-To: <4121A211.8080902@gmx.net>
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On Tue, 2004-08-17 at 08:13, Jens Maurer wrote:
> The attached patch (against kernel 2.6.8.1) enables using SSE
> instructions for copy_page and clear_page.
>
> A user-space test on my Pentium III 850 MHz shows a 3x speedup for
> clear_page (compared to the default "rep stosl"), and a 50% speedup
> for copy_page (compared to the default "rep movsl"). For a Pentium-4,
> the speedup is about 50% in both the clear_page and copy_page cases.
we used to have code like this in 2.4 but it got removed: the non
temperal store code is faster in a microbenchmark but has the
fundamental problem that it evics the data from the cpu cache; the
actual USE of the data thus is a LOT more expensive, result is that the
overall system performance goes down ;(
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next prev parent reply other threads:[~2004-08-17 7:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-17 6:13 [PATCH] Use x86 SSE instructions for clear_page, copy_page Jens Maurer
2004-08-17 7:27 ` Arjan van de Ven [this message]
2004-08-17 8:10 ` Andrey Panin
2004-08-17 8:11 ` Arjan van de Ven
2004-08-17 22:40 ` Jens Maurer
2004-08-18 2:33 ` David S. Miller
2004-08-22 20:49 ` Jens Maurer
2004-08-18 7:00 ` Ingo Molnar
2004-08-18 7:11 ` Ingo Molnar
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