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List:       linux-scsi
Subject:    Re: Intel X25-M MLC SSD benchmarks
From:       "Bart Van Assche" <bart.vanassche () gmail ! com>
Date:       2008-12-12 7:15:01
Message-ID: e2e108260812112315q5ed1d265q86cf22b1dd59c69d () mail ! gmail ! com
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On Fri, Dec 12, 2008 at 5:55 AM, Eric D. Mudama <edmudama@gmail.com> wrote:
> On 12/11/08, Eric D. Mudama <edmudama@gmail.com> wrote:
>> Out of curiosity, is write cache enabled or disabled on these devices?
>
> Oops, I just noticed the oflag=direct, that can have a huge
> performance difference depending on the block size.
>
> What numbers are you getting without oflag=direct?

IMHO repeating the measurements without oflag=direct does not make
sense: measurements with oflag=direct tell something about the
performance of the SSD and the software layers on top of it. Without
oflag=direct writes are buffered by Linux and data is written
asynchronously to the SSD.

Bart.
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