Messages in this thread | | | Date | Fri, 10 Nov 2006 10:24:57 +0100 | From | Jens Axboe <> | Subject | Re: async I/O seems to be blocking on 2.6.15 |
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On Mon, Nov 06 2006, Chen, Kenneth W wrote: > I haven't done the measurement whether the time to submit I/O grows > linearly with respect to I/O size. Most likely it will. If it is > not, then we might have a scaling problem (though I don't believe we > have this problem).
I would not expect it to, but ran a simple test to check submission times from 32KiB to 2MiB:
Size Time (usecs) ---------------------------- 2MiB 223 1MiB 112 512KiB 56 256KiB 29 128KiB 14 32KiB 4
(note that I skipped 64KiB, things got boring). That clearly shows a linear increase in time, so no scaling problem there.
-- Jens Axboe
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