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Message-ID: <20061201172749.GZ5400@kernel.dk> Date: Fri, 1 Dec 2006 18:27:49 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: "Raz Ben-Jehuda(caro)" <raziebe@...il.com> Cc: linux-aio@...ck.org, Linux Kernel <linux-kernel@...r.kernel.org>, suparna@...ibm.com Subject: Re: slow io_submit 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. > 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. Right now nobody is working on that afaik, so it's not something that will hit the next kernel. -- Jens Axboe - 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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