Date: Thu, 04 Sep 2003 19:39:25 +1200 From: Mark Kirkwood <markir@paradise.net.nz> To: questions@freebsd.org Subject: Re: IO To IDE Blocking In 5.1 Message-ID: <3F56EC2D.1050508@paradise.net.nz> In-Reply-To: <3F50335D.1030807@paradise.net.nz> References: <3F50335D.1030807@paradise.net.nz>
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Poor form to anwser my own question but .... I removed and inspected the IDE cables... found one with some damage - I suspect this is the cause. Happend to get a Promise TX2000 raid card yesterday , so I reinstalled (+ new cables). Retesting the scenario finds that iostat is not blocked. regards Mark P.s : Still seeing loss of 2 processor scaling where *any* io is involved, but I will study this some more and post to smp if cant understand it (I wonder if its something to do with running 2 copies of the *same* binary). Mark Kirkwood wrote: > ..... > iostat blocks until the process is completed. If I start iostat > *first*, then it does not block, and > I can see the io activity generated by the process when it starts. > > I am running the SMP kernel, but can reproduce this using GENERIC. > > Any ideas ?
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