Messages in this thread | | | Date | Thu, 2 Dec 2004 15:41:34 +0100 | From | Jens Axboe <> | Subject | Re: Time sliced CFQ io scheduler |
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On Thu, Dec 02 2004, Giuliano Pochini wrote: > > > On Thu, 2 Dec 2004, Jens Axboe wrote: > > > Case 4: write_files, random, bs=4k > > Just a thought... in this test the results don't look right. Why > aggregate bandwidth with 8 clients is higher than with 4 and 2 clients ? > In the cfq test with 8 clients aggregate bw is also higher than with > a single client.
I don't know what happens with the 4 client case, but it's not that unlikely that aggregate bandwidth will be higher for more threads doing random writes, as request coalesching will help minimize seeks.
But I did think it was strange with the 4 client case dip was strange, it was reproducable though (as are all the results, they have very little variance).
-- Jens Axboe
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