Messages in this thread | | | Date | Wed, 4 Jul 2007 06:22:48 -0400 (EDT) | From | Justin Piszcz <> | Subject | Re: Some NCQ numbers... |
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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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