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Message-ID: <5d96567b0607130932g7ba6cf0jfebdb0af9c933000@mail.gmail.com>
Date: Thu, 13 Jul 2006 19:32:07 +0300
From: "Raz Ben-Jehuda(caro)" <raziebe@gmail.com>
To: linux-aio@kvack.org
Subject: Re: io_submit() taking a long time to return ?
Cc: "Xavier Roche" <roche+kml2@exalead.com>, linux-kernel@vger.kernel.org,
       "linux-aio Zach Brown" <zach.brown@oracle.com>
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Zach !!!
what do u means by "sync block mapping " ?

thank u
raz


On 7/13/06, Zach Brown <zach.brown@oracle.com> wrote:
> > By reading the aio documentation, we expected the io_submit call to
> > always return immediately,
>
> Sadly, that isn't guaranteed.
>
> > but in our preliminary tests we noticed that
> > sometimes this call can take a long time (more than 10 ms, even
> > sometimes more than 30 ms !!).
>
> If I had to guess I'd suspect that these delays are due to sync block
> mapping lookups in the submit path.  Do these tend to show up the first
> time you read a file?
>
> - z
>
> --
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>


-- 
Raz