From: Bill Davidsen <davidsen@tmr.com>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>,
spamtrap@knobisoft.de, linux-kernel@vger.kernel.org,
a.p.zijlstra@chello.nl, wfg@mail.ustc.edu.cn,
torvalds@linux-foundation.org, riel@redhat.com
Subject: Re: 2.6.24-rc1: First impressions
Date: Sat, 27 Oct 2007 15:14:19 -0400 [thread overview]
Message-ID: <47238E0B.2010601@tmr.com> (raw)
In-Reply-To: <20071026124252.aba97af4.akpm@linux-foundation.org>
Andrew Morton wrote:
> On Fri, 26 Oct 2007 21:33:40 +0200
> Ingo Molnar <mingo@elte.hu> wrote:
>
>> * Andrew Morton <akpm@linux-foundation.org> wrote:
>>
>> so a final 'sync' should be added to the test too, and the time it takes
>> factored into the bandwidth numbers?
>
> That's one way of doing it. Or just run the test for a "long" time. ie:
> much longer than (total-memory / disk-bandwidth). Probably the latter
> will give a more accurate result, but it can get boring.
>
Longer might be less inaccurate, but without flushing the last data you
really don't get best accuracy, you just reduce the error. Clearly doing
fdatasync() is best, since other i/o caused by sync() can skew the results.
--
Bill Davidsen <davidsen@tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
next prev parent reply other threads:[~2007-10-27 19:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-26 14:18 2.6.24-rc1: First impressions Martin Knoblauch
2007-10-26 15:22 ` Ingo Molnar
2007-10-26 15:29 ` Peter Zijlstra
2007-10-26 15:49 ` Rik van Riel
2007-10-26 19:21 ` Andrew Morton
2007-10-26 19:33 ` Ingo Molnar
2007-10-26 19:42 ` Andrew Morton
2007-10-27 19:14 ` Bill Davidsen [this message]
2007-10-27 5:46 ` Arjan van de Ven
2007-10-27 5:59 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2007-10-29 8:29 Martin Knoblauch
2007-10-29 11:09 Martin Knoblauch
2007-10-29 11:40 ` Ingo Molnar
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