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Re: Promblem with PREF (prefetching) in memcpy

To: Carsten Langgaard <carstenl@mips.com>
Subject: Re: Promblem with PREF (prefetching) in memcpy
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: 04 Oct 2002 14:09:43 +0100
Cc: Dominic Sweetman <dom@algor.co.uk>, Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org
In-reply-to: <3D9D8B2E.8258A952@mips.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <3D9D484B.4C149BD8@mips.com> <200210041153.MAA12052@mudchute.algor.co.uk> <3D9D855B.12128FA2@mips.com> <1033734968.31839.5.camel@irongate.swansea.linux.org.uk> <3D9D8B2E.8258A952@mips.com>
Sender: linux-mips-bounce@linux-mips.org
On Fri, 2002-10-04 at 13:35, Carsten Langgaard wrote:
> That's exactly the problem.
> The actually loads and stores in memcpy is fine, it's the prefetching that
> prefetch too much.

Then fix your prefetching code 8). We had problems with that on x86 too,
prefetching off the last page into ISA space -> death. Was umm fun to
debug


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