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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@gmail.com>
To: "Linux Kernel" <linux-kernel@vger.kernel.org>
Subject: Re: slow io_submit
Cc: linux-aio@kvack.org, "Jens Axboe" <jens.axboe@oracle.com>
In-Reply-To: <20061201172749.GZ5400@kernel.dk>
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On 12/1/06, Jens Axboe <jens.axboe@oracle.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
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