linux-kernel - Re: [PATCH 6/6] cfq: Increase default value of target

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Message-ID: <x49k3834kel.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 26 Jun 2014 14:04:34 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Jens Axboe <axboe@...nel.dk>,
	Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH 6/6] cfq: Increase default value of target_latency

Mel Gorman <mgorman@...e.de> writes:

>> And we should probably run our standard set of I/O exercisers at the
>> very least.  But, like I said, it seems like wasted effort.
>> 
>
> Out of curiousity, what do you consider to be the standard set of I/O
> exercisers?

Yes, that was vague, sorry.  I was referring to any io generator that
will perform sequential and random I/O (writes, re-writes, reads, random
writes, random reads, strided reads, backwards reads, etc).  We use
iozone internally, testing both buffered and direct I/O, varying file
and record sizes and across multiple file systems.  Data sets that fall
inside of the page cache tend to have a high standard deviation, so, as
an I/O guy, I ignore those.  ;-)

Cheers,
Jeff
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