Re: Intel X25-M MLC SSD benchmarks

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On Fri, Dec 12, 2008 at 12:15 AM, Bart Van Assche
<bart.vanassche@xxxxxxxxx> wrote:
>
> On Fri, Dec 12, 2008 at 5:55 AM, Eric D. Mudama <edmudama@xxxxxxxxx> wrote:
> > On 12/11/08, Eric D. Mudama <edmudama@xxxxxxxxx> 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.

Oops, I guess I assumed that by writing a few gigabytes of data it
wouldn't matter that much.  I'll run the test again in a bit once I'm
off this solaris machine.
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