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References: <patchbomb.1240551141@sermon.lab.mkp.net>
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Date: Fri, 24 Apr 2009 16:37:17 +0200
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Message-ID: <ed038eb20904240737u4d248b63s580f7d4d1831e173@mail.gmail.com>
Subject: Re: [PATCH 2 of 9] block: Export I/O topology for block devices and 
	partitions
From: Carl Henrik Lunde <chlunde@ping.uio.no>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Jeff Garzik <jeff@garzik.org>, Kay Sievers <kay.sievers@vrfy.org>,
       rwheeler@redhat.com, snitzer@redhat.com, neilb@suse.de,
       James.Bottomley@hansenpartnership.com, dgilbert@interlog.com,
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> On Fri, Apr 24, 2009 at 07:32, Martin K. Petersen <martin.petersen@oracle.com> wrote:
> +What: ? ? ? ? ?/sys/block/<disk>/alignment
> +What: ? ? ? ? ?/sys/block/<disk>/<partition>/alignment
> +What: ? ? ? ? ?/sys/block/<disk>/queue/minimum_io_size
> +What: ? ? ? ? ?/sys/block/<disk>/queue/optimal_io_size

Would it also be possible and useful to include the number of
spindles/channels, i.e., how many requests the device can handle
concurrently?  CFQ could for example serve two time slices
concurrently if you have sequential reads and the device reports two
spindles.

[sorry for replying in the middle of the thread, but I didn't get the
original email]
-- 
mvh
Carl Henrik
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