Messages in this thread | | | Subject | Re: performance "regression" in cfq compared to anticipatory, deadline and noop | From | Kasper Sandberg <> | Date | Wed, 14 May 2008 02:33:03 +0200 |
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On Tue, 2008-05-13 at 15:51 +0200, Kasper Sandberg wrote: > On Tue, 2008-05-13 at 14:20 +0200, Jens Axboe wrote: > > On Sun, May 11 2008, Kasper Sandberg wrote: > > > On Sun, 2008-05-11 at 14:14 +0100, Daniel J Blueman wrote: > > > > I've been experiencing this for a while also; an almost 50% regression > > > > is seen for single-process reads (ie sync) if slice_idle is 1ms or > > > > more (eg default of 8) [1], which seems phenomenal. > <snip> > > > <snip> > > i expect to get around to doing this this afternoon, or tonight at > ~02:00 > (im GMT+1).
Well :) not too far off(02:32 now)
http://62.242.235.92/~redeeman/blktrace.tar.bz2
it contains the blktrace with cfq, noop, anticipatory and deadline, along with the output of blktrace and hdparm.
Hope it helps.
> > > > > > If someone would send me a blktrace of such a slow run, that would be > > nice. Basically just do a blktrace /dev/sda (or whatever device) while > > doing the hdparm, preferably storing output files on a difference > > device. Then send the raw sda.blktrace.* files to me. Thanks! > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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