Date: Mon, 06 Sep 1999 22:08:35 +0200 From: "P.C. Uiterlinden" <puiterl@hacom.nl> To: Albert Max Lai <amlai@columbia.edu> Cc: aic7xxx@freebsd.org Subject: Re: Tagged queueing = lower write throughput? Message-ID: <37D41F43.FE1B754A@hacom.nl> References: <37CEE504.B84D6E75@hacom.nl> <14287.61853.465632.692046@konichiwa.cc.columbia.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
Albert, Thanks for replying to my mail. Now I at least know I'm not the only one experiencing this kind of behavior. Still I think it's strange that tagged queuing is able to slow things down. I can't think of an obvious reason. Anyone cares to come up with one? Meanwhile, I'll download the manual of the hard disk to see if I can discover something for my self. Regards, Paul. Albert Max Lai wrote: > > On Thursday, 2 September 1999, P.C. Uiterlinden wrote: > > > While playing with RAID0, I found out that enabling tagged queueing > > deteriorates write throughput considerably. The MD driver seems not > > I have noticed that one has to play around with the queueing depth to > get the highest throughput. With my IBM DGVSO9U (9ZX), the optimal > queuing depth is between 12-14. With my Quantum Viking 4.5 NSE, having > tagged queueing turned on slows it down. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?37D41F43.FE1B754A>