From owner-freebsd-stable  Fri Aug 11  1:33: 8 2000
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From: Soren Schmidt <sos@freebsd.dk>
Message-Id: <200008110833.KAA53432@freebsd.dk>
Subject: Re: SiS 5595 - can do UDMA-66. patch for test.
In-Reply-To: <XFMail.000811103236.steveo@eircom.net> from "Steve O'Hara-Smith" at "Aug 11, 2000 10:32:36 am"
To: steveo@eircom.net (Steve O'Hara-Smith)
Date: Fri, 11 Aug 2000 10:33:02 +0200 (CEST)
Cc: freebsd-stable@freebsd.org, sos@freebsd.org
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It seems Steve O'Hara-Smith wrote:
>         Hi,
> 
>         I have a box with a SiS 5595 which is recognised as a 5591. As far as I
> can tell the only difference is that 5595 does UDMA66. The (very simple)
> patch below trys for UDMA66 on a 5591 and (with mine at least) gets it (the
> improvement is not subtle). The patch is against -stable a while ago, I've been
> soaking it ever since.

Erhm, since you dont program the chip differently you hardly get UDMA66
speeds, just the mode :)

A simple test is to verify the interface speed by doing fx:

dd if=/dev/adN of=/dev/null bs=1m count=1 iseek=0

on an unmounted disk (the bs should be within the disk cacke size)

This 2-3 times in a row should give an idea of the interface speed...

-Søren


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