Date: 20 Feb 2003 19:17:03 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: FreeBSD Stable List <freebsd-stable@freebsd.org> Cc: freebsd-scsi@freebsd.org Subject: Curious SCSI and/or Firewire Problem Message-ID: <1045730822.40318.19.camel@chowder.gsoft.com.au>
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I am testing a firewire enclosure and a SCSI card. The SCSI card is an Init-IO 940/950 and I obtained a driver from someone who back ported it from OpenBSD (hopefully it will be committed soon :) I notice that the firewire enclosure does ~20-25Mb/sec by itself, and the SCSI disk (old slow 1Gb) does 4.5Mb/sec by itself. If I run them both they act very bursty - neither runs at full usage all of the time, or at top speed. These measurement are made with 'systat -vmstat 1'. It is almost as if they are blocking each other in the kernel, but I'm not sure. My disk exerciser consists of dd'ing from /dev/zero into a file on the disks. The machine is running 4.7 from a few days ago. Anyone have any ideas what it could be? I haven't tried it with the IDE disk that is on this system yet. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 9A8C 569F 685A D928 5140 AE4B 319B 41F4 5D17 FDD5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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