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Date: Tue, 10 Nov 2009 10:55:47 -0500 From: Jeff Moyer <jmoyer@...hat.com> To: Jens Axboe <jens.axboe@...cle.com> Cc: Corrado Zoccolo <czoccolo@...il.com>, Linux-Kernel <linux-kernel@...r.kernel.org>, aaronc@...ato.unsw.edu.au Subject: Re: [RFC, PATCH] cfq-iosched: remove redundant queuing detection code Jens Axboe <jens.axboe@...cle.com> writes: >> Why don't we simply use the value configured via the queue_depth sysfs >> file? > > First of all, that only covers SCSI. We could do that by having the tag > on/off functions set the same flag. But even for such devices, actual > tag depth is dependent upon what other devices are on the controller > (since it's often a shared map) and may not even be statically > detectable in the sense that actual depth is only really seen when the > device returns busy on a queue attempt. > > In most cases it would work fine, but the dynamic detection is more > reliable. The sysfs setting in reality is max setting. OK, thanks for the patient explanation, Jens! 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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