From: Jens Axboe <jens.axboe@oracle.com>
To: "Raz Ben-Jehuda(caro)" <raziebe@gmail.com>
Cc: linux-aio@kvack.org, Linux Kernel <linux-kernel@vger.kernel.org>,
suparna@in.ibm.com
Subject: Re: slow io_submit
Date: Fri, 1 Dec 2006 18:27:49 +0100 [thread overview]
Message-ID: <20061201172749.GZ5400@kernel.dk> (raw)
In-Reply-To: <5d96567b0612010904s361b799t8db72accc287ca54@mail.gmail.com>
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
next prev parent reply other threads:[~2006-12-01 17:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-01 17:04 slow io_submit Raz Ben-Jehuda(caro)
2006-12-01 17:27 ` Jens Axboe [this message]
2006-12-01 21:40 ` Raz Ben-Jehuda(caro)
2006-12-04 15:38 ` Phillip Susi
2006-12-05 16:23 ` Raz Ben-Jehuda(caro)
2006-12-05 21:18 ` Phillip Susi
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