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Re: Prefetches in memcpy

To: "Kevin D. Kissell" <>
Subject: Re: Prefetches in memcpy
From: Alan Cox <>
Date: 05 Nov 2002 17:26:11 +0000
Cc: Ralf Baechle <>, Carsten Langgaard <>,
In-reply-to: <00fb01c284e6$5b7bf4f0$10eca8c0@grendel>
Original-recipient: rfc822;
References: <> <> <00fb01c284e6$5b7bf4f0$10eca8c0@grendel>
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)

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