linux-kernel - how to calculate latency for block devices?

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Message-ID: <4FAD37F9.4030403@gmail.com>
Date:	Fri, 11 May 2012 20:02:01 +0400
From:	George Shuklin <george.shuklin@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: how to calculate latency for block devices?

Good day.

How to properly calculate average latency for block devices?

(read_ticks+write_ticks)/requests or 
(read_ticks+write_ticks+time_in_queue)/requests? (Or just 
time_in_queue/requests?)

Thanks.
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