Date: Fri, 5 Nov 1999 13:24:07 -0600 (CST) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: Ollivier Robert <roberto@keltia.freenix.fr> Cc: scsi@FreeBSD.ORG Subject: Re: SYM-0.9.0 ok for 3.3 and -current (was SYM driver available for -stable) Message-ID: <Pine.BSF.4.20.9911051318110.59417-100000@mail.wolves.k12.mo.us> In-Reply-To: <19991105001108.A1825@keltia.freenix.fr>
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On Fri, 5 Nov 1999, Ollivier Robert wrote: > According to Gerard Roudier: > > Could you check that tagged commands and disconnections are enabled for > Tagged commands are disabled for these drives (IBM DCAS) because > it gives them bad perfs in sequential reads/writes. I've > re-enabled them on my machine because I think tags help for > multiple accesses and I don't care that much for sequential > perfs... You have the same drives I do. I forgot that there was a quirk entry for these drives disabling tagged commands. Do you see any "choppyness" using either the old ncr driver or the new sym driver when you have the system under a high I/O load? With tags enabled/disabled? Under heavy CPU load as well? I would spent some time clarifying the "choppyness" I'm seeing a bit better yesterday, but I had to go out and buy a new car instead. Maybe tonight I'll look into it. -- Chris Dillon - cdillon@wolves.k12.mo.us - cdillon@inter-linc.net FreeBSD: The fastest and most stable server OS on the planet. For Intel x86 and Alpha architectures (SPARC under development). ( http://www.freebsd.org ) "One should admire Windows users. It takes a great deal of courage to trust Windows with your data." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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