From: Jens Axboe <jens.axboe@oracle.com>
To: Gurudas Pai <gurudas.pai@oracle.com>
Cc: john smith <whalajam@yahoo.com>,
"Alan D. Brunelle" <Alan.Brunelle@hp.com>,
fio@vger.kernel.org
Subject: Re: io scheduler merges control
Date: Mon, 11 Jan 2010 14:52:56 +0100 [thread overview]
Message-ID: <20100111135256.GM4489@kernel.dk> (raw)
In-Reply-To: <4B4AC214.5020207@oracle.com>
On Mon, Jan 11 2010, Gurudas Pai wrote:
>
>> 3) The third question is why the number of fio reported "merge"(s) is greater than the number of the "ios"?
> These merges are since disk is online. not during the current fio run.
> Restart the machine/disk and run fio test , then fio should report
> accurate merge stats.
That's not correct, it is the number of merges that occured while fio
was running. What Alan said is correct, the ios count is the issued
number of ios. Merges can easily be much larger, for this case of small
bs sequential IO it will indeed be pretty huge.
--
Jens Axboe
next prev parent reply other threads:[~2010-01-11 13:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-24 19:12 io scheduler merges control john smith
2010-01-04 14:34 ` Alan D. Brunelle
2010-01-05 1:53 ` john smith
2010-01-05 16:32 ` Alan D. Brunelle
2010-01-11 13:54 ` Jens Axboe
2010-01-14 18:37 ` john smith
2010-01-20 16:18 ` Alan D. Brunelle
2010-01-20 23:57 ` john smith
2010-01-11 6:15 ` Gurudas Pai
2010-01-11 13:52 ` Jens Axboe [this message]
2010-01-04 14:52 ` Chris Worley
2010-01-05 0:27 ` john smith
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