From: Jens Axboe <axboe@kernel.dk>
To: "Neto, Antonio Jose Rodrigues" <Antonio.Jose.Rodrigues.Neto@netapp.com>
Cc: zhu.yanhai@gmail.com, "Rettl,
Matthias" <Matthias.Rettl@netapp.com>,
fio@vger.kernel.org
Subject: Re: Bad performance when reads and writes on same LUN
Date: Fri, 02 Sep 2011 21:09:26 -0600 [thread overview]
Message-ID: <4E619A66.4040605@kernel.dk> (raw)
In-Reply-To: <116197A0179A3D4A95B135E5F0341FC11041B4D8@SACMVEXC2-PRD.hq.netapp.com>
On 2011-09-02 21:06, Neto, Antonio Jose Rodrigues wrote:
> The question that I have is:
>
> "Buffered aio will fall back to sync io, and it's known that mixing"
>
> Why did buffered aio will fall back to sync io?
Please don't top post, reply beneat the original text.
Buffered aio will degenerate to normal sync IO, because the kernel does
not support async buffered io.
--
Jens Axboe
next prev parent reply other threads:[~2011-09-03 3:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-03 3:06 Bad performance when reads and writes on same LUN Neto, Antonio Jose Rodrigues
2011-09-03 3:09 ` Jens Axboe [this message]
-- strict thread matches above, loose matches on Subject: below --
2011-09-03 3:24 Neto, Antonio Jose Rodrigues
2011-09-03 3:28 ` Jens Axboe
2011-09-02 23:50 Neto, Antonio Jose Rodrigues
2011-09-03 0:00 ` Zhu Yanhai
2011-09-02 15:32 Rettl, Matthias
2011-09-02 23:43 ` Zhu Yanhai
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