linux-mips
[Top] [All Lists]

Re: Prefetches in memcpy

To: "Kevin D. Kissell" <kevink@mips.com>
Subject: Re: Prefetches in memcpy
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: 05 Nov 2002 17:26:11 +0000
Cc: Ralf Baechle <ralf@uni-koblenz.de>, Carsten Langgaard <carstenl@mips.com>, linux-mips@linux-mips.org
In-reply-to: <00fb01c284e6$5b7bf4f0$10eca8c0@grendel>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <3DC7CB8B.E2C1D4E5@mips.com> <20021105163806.A24996@bacchus.dhis.org> <00fb01c284e6$5b7bf4f0$10eca8c0@grendel>
Sender: linux-mips-bounce@linux-mips.org
On Tue, 2002-11-05 at 16:13, Kevin D. Kissell wrote:
> Assuming we had a version that prefetched exactly to the end
> of the source memory block and no further, why would we need
> the second variant?

memcpy_to/from_io needs to do strictly ordered fetches on some devices
which fake a memory range with a fifo for performance (pci bursting
dirty tricks)


<Prev in Thread] Current Thread [Next in Thread>