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Message-ID: <5d96567b0612011340m410a2294w9b02b619a62888da@mail.gmail.com> Date: Fri, 1 Dec 2006 23:40:31 +0200 From: "Raz Ben-Jehuda(caro)" <raziebe@...il.com> To: "Linux Kernel" <linux-kernel@...r.kernel.org> Cc: linux-aio@...ck.org, "Jens Axboe" <jens.axboe@...cle.com> Subject: Re: slow io_submit On 12/1/06, Jens Axboe <jens.axboe@...cle.com> wrote: > On Fri, Dec 01 2006, Raz Ben-Jehuda(caro) wrote: > > Jens suparna hello > > > > I have managed to understand why io_submit is sometimes very slow. > > It is because the device is plugged once too many io's are being sent. > > I have conducted a simple test with nr_request to default value of 128 > > and and 256. > > and it proved to be correct. > > I don't understand your email. The device is plugged when it is empty, > not when it has emptied the request list. first , i am not top posting you. I made a mistake and associated plugging with a full queue. > > I would truely appreciate your comment on this. > > On what? :-) > > If it's no blocking and returning EAGAIN instead, then I agree this is > what should eventually happen. Who returns EGAIN to whom ? I am not sure i understand what you mean here. > Right now nobody is working on that > afaik, so it's not something that will hit the next kernel. thank you raz > -- > Jens Axboe > > -- Raz - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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