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Date: Tue, 11 Dec 2012 06:27:42 -0800 From: Tejun Heo <tj@...nel.org> To: Vivek Goyal <vgoyal@...hat.com> Cc: Zhao Shuai <zhaoshuai@...ebsd.org>, axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com, linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, containers@...ts.linux-foundation.org Subject: Re: performance drop after using blkcg On Tue, Dec 11, 2012 at 09:25:18AM -0500, Vivek Goyal wrote: > In general, do not use blkcg on faster storage. In current form it > is at best suitable for single rotational SATA/SAS disk. I have not > been able to figure out how to provide fairness without group idling. I think cfq is just the wrong approach for faster non-rotational devices. We should be allocating iops instead of time slices. Thanks. -- tejun -- 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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