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Date: Mon, 28 Jun 2010 14:54:35 -0400 From: Jeff Moyer <jmoyer@...hat.com> To: Jens Axboe <axboe@...nel.dk> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] cfq: always return false from should_idle if slice_idle is set to zero Jens Axboe <axboe@...nel.dk> writes: > On 28/06/10 20.41, Jeff Moyer wrote: >> Jens Axboe <axboe@...nel.dk> writes: >> >>> On 21/06/10 21.49, Jeff Moyer wrote: >>>> Hi, >>>> >>>> In testing a competing fsync-ing process and a sequential reader on >>>> mid-grade storage, I found that cfq was incapable of achieving the I/O >>>> rates of deadline, no matter how it was tuned. Investigation, and insight >>>> from Vivek (mostly the latter), led to identifying that we were still >>>> idling for the last queue in the service tree. >>>> >>>> Modifying cfq_should_idle to not idle when slice_idle is set to zero got >>>> us much closer to the performance of deadline for this workload. I have >>>> one follow-on patch that gets us on-par with deadline, but I think this >>>> patch stands alone. >>>> >>>> Comments, as always, are appreciated. >>> >>> This looks good. >> >> So.... applied to which branch? > > Not applied yet, unless I explicitly say it's applied, then it's not > necessarily in any public git tree yet. But this will go into .35. OK, thanks for the clarification. Cheers, Jeff -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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