Date: Thu, 26 Nov 1998 21:20:35 -0600 (CST) From: Stormy Henderson <stormy@futuresouth.com> To: questions@FreeBSD.ORG Subject: Slow CCD Message-ID: <199811270320.VAA23941@shell.futuresouth.com>
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I have an Adaptec 2940 with 2 matched 1GB SCSI-2 drives, 5400rpm, 10ms access. Using dd bs=1m count=128 if=/dev/da0s1e of=/dev/null, I get 4MB per second, and about the same with 8k blocks. Using CCD with an interleave of 512, and the same dd, I get 1MB per second. Increasing the interleave to 65535 improves performance to a miserable 1.7MB per second. Forgetting interleave and just concatting them doesn't do any better. I have a p133, by the way. Is the abysmal performance normal on my hardware? I'm using 3.0-19981123-SNAP. -- Stormy Henderson To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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