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Date: Sun, 10 Aug 1997 10:39:03 +0200
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From: Mats Lofkvist <mal@algonet.se>
To: current@FreeBSD.ORG
In-reply-to: <199708100651.XAA05892@hub.freebsd.org>
	(owner-current-digest@FreeBSD.ORG)
Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it)
Sender: owner-freebsd-current@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

The dd test on a 486/100 32MB with an old bt445s scsi controller and a
quantum capella 2GB disk running FreeBSD 2.2.2R:

bash# dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k
1600+0 records in
1600+0 records out
104857600 bytes transferred in 17.838889 secs (5878034 bytes/sec)

bash# dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k & dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k
[1] 297
1600+0 records in
1600+0 records out
104857600 bytes transferred in 32.622429 secs (3214279 bytes/sec)
1600+0 records in
1600+0 records out
104857600 bytes transferred in 32.574877 secs (3218971 bytes/sec)

bash# dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k & sleep 1; dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k
[1] 572
1600+0 records in
1600+0 records out
104857600 bytes transferred in 37.597098 secs (2788981 bytes/sec)
1600+0 records in
1600+0 records out
104857600 bytes transferred in 37.592102 secs (2789352 bytes/sec)

bash# dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k & sleep 2; dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k
[1] 321
1600+0 records in
1600+0 records out
104857600 bytes transferred in 36.997771 secs (2834160 bytes/sec)
1600+0 records in
1600+0 records out
104857600 bytes transferred in 36.876216 secs (2843502 bytes/sec)

(There was very audible searching on the disk going on when running
the last two. Didn't seem to affect performance very much though.)


This is not exactly high end hardware, still it performs quite good.


      _
Mats Lofkvist
mal@algonet.se