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Date:	Tue, 10 Nov 2009 10:55:47 -0500
From:	Jeff Moyer <>
To:	Jens Axboe <>
Cc:	Corrado Zoccolo <>,
	Linux-Kernel <>,
Subject: Re: [RFC, PATCH] cfq-iosched: remove redundant queuing detection code

Jens Axboe <> 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!

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