Re: Some NCQ numbers...

[Justin Piszcz]

On Wed, 4 Jul 2007, Michael Tokarev wrote:

> Tejun Heo wrote:
> > Hello,
> >
> > Michael Tokarev wrote:
> > > Well.  It looks like the results does not depend on the
> > > elevator.  Originally I tried with deadline, and just
> > > re-ran the test with noop (hence the long delay with
> > > the answer) - changing linux elevator changes almost
> > > nothing in the results - modulo some random "fluctuations".
> >
> > I see.  Thanks for testing.
>
> Here are actual results - the tests were still running when
> I replied yesterday.
>
> Again, this is Seagate ST3250620AS "desktop" drive, 7200RPM,
> 16Mb cache, 250Gb capacity.  The tests were performed with
> queue depth = 64 (on mptsas), drive write cache is turned
> off.

I found AS scheduler to be the premium and best for single-user performance.

You want speed? Use AS.

http://home.comcast.net/~jpiszcz/sched/cfq_vs_as_vs_deadline_vs_noop.html

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