From owner-freebsd-current  Tue Mar 30  1:34:26 1999
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From: Soren Schmidt <sos@freebsd.dk>
Message-Id: <199903300933.LAA60345@freebsd.dk>
Subject: Re: the ATA driver
In-Reply-To: <Pine.BSF.4.05.9903300225480.243-100000@culverk.student.umd.edu> from Kenneth Wayne Culver at "Mar 30, 1999  2:28: 0 am"
To: culverk@wam.umd.edu (Kenneth Wayne Culver)
Date: Tue, 30 Mar 1999 11:33:45 +0200 (CEST)
Cc: current@FreeBSD.ORG
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It seems Kenneth Wayne Culver wrote:
> Just letting someone know/confirming something:
> 
> The ata drivers cvsupped 10 minutes ago have slowed my disk access to a
> crawl. I went from 12 MB per second to 6 MB per second. Just thought I'd
> let someone know because this seems to be a major problem. Thanks.

This can only be the case on a Promise controller, I have allready
committed a fix for that (it always selected PIO mode).

A current quick test on a 5400RPM IBM disk shows:

IOZONE performance measurements:
        9768393 bytes/second for writing the file
        11820143 bytes/second for reading the file

Remember that we have lost significant I/O bandwidth currently due 
to changes in vfs_bio and freinds.

-Søren


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