From: Ingo Molnar <mingo@elte.hu>
To: Jens Maurer <Jens.Maurer@gmx.net>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
Arjan van de Ven <arjanv@redhat.com>
Subject: Re: [PATCH] Use x86 SSE instructions for clear_page, copy_page
Date: Wed, 18 Aug 2004 09:11:12 +0200 [thread overview]
Message-ID: <20040818071112.GA11543@elte.hu> (raw)
In-Reply-To: <20040818070013.GA11048@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> executed SSE code? You are corrupting those registers.
doh - should read before i write. The code is perfectly fine.
Arjan's cache arguments remain. What i'd suggest to test is the precise
speed of compiling the kernel, fully done in ramfs. (if you dont have
enough RAM for this then compile a portion of the kernel.) For the
testing, add a /proc/sys switch to turn the SSE functions on/off
runtime, hence you can eliminate the effects of page placement. If the
compilation timings are stable enough then you can try the runtime
switch to see whether it has any effect. There should be a small but
visible change (in one direction or the other), as compilation brings in
lots of new pages and copies around stuff too.
Ingo
prev parent reply other threads:[~2004-08-18 7:09 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
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 [this message]
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