| 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) |
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