Date: Tue, 30 Mar 1999 11:33:45 +0200 (CEST) From: Soren Schmidt <sos@freebsd.dk> To: culverk@wam.umd.edu (Kenneth Wayne Culver) Cc: current@FreeBSD.ORG Subject: Re: the ATA driver Message-ID: <199903300933.LAA60345@freebsd.dk> 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"
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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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