From: Lorenzo Allegrucci <l_allegrucci@despammed.com>
To: Jens Axboe <axboe@suse.de>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.6-mm5 oops mounting ext3 or reiserfs with -o barrier
Date: Sun, 23 May 2004 22:41:13 +0200 [thread overview]
Message-ID: <200405232241.14069.l_allegrucci@despammed.com> (raw)
In-Reply-To: <20040523173100.GA9914@suse.de>
On Sunday 23 May 2004 19:31, Jens Axboe wrote:
> It just looks odd that eg reads vary as much as they do, and that -o
> barrier=1 makes -W0 reads faster (and faster then -W1 even). remove
> looks reasonable for -W1, but -W0 is still faster. That is _really_ odd.
I rerun all tests with noatime.
Using noatime numbers look more predictable but I cannot guarantee
any statistical relevance.
hdparm -W1
ext3 (-o barrier=0,noatime)
untar read copy remove
0m56.744s 0m22.452s 1m26.558s 0m20.683s
0m7.187s 0m1.153s 0m0.747s 0m0.101s
0m6.077s 0m3.045s 0m9.132s 0m1.907s
ext3 (-o barrier=1,noatime)
untar read copy remove
0m55.152s 0m21.340s 1m23.705s 0m19.369s
0m7.237s 0m1.217s 0m0.788s 0m0.077s
0m6.513s 0m3.082s 0m9.226s 0m1.507s
haparm -W0
ext3 (-o barrier=0,noatime)
untar read copy remove
1m55.221s 0m23.768s 2m12.458s 0m22.256s
0m7.227s 0m1.216s 0m0.756s 0m0.085s
0m6.424s 0m3.002s 0m9.085s 0m1.560s
ext3 (-o barrier=1,noatime)
untar read copy remove
1m56.578s 0m23.382s 2m14.117s 0m22.289s
0m7.035s 0m1.202s 0m0.766s 0m0.089s
0m6.814s 0m3.103s 0m9.141s 0m1.696s
--
Lorenzo
next prev parent reply other threads:[~2004-05-23 20:40 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-22 19:07 Lorenzo Allegrucci
2004-05-22 19:21 ` Andrew Morton
2004-05-22 21:20 ` Jens Axboe
2004-05-22 21:30 ` Jens Axboe
2004-05-23 8:58 ` Lorenzo Allegrucci
2004-05-23 9:11 ` Jens Axboe
2004-05-23 10:03 ` Jens Axboe
2004-05-23 15:32 ` Lorenzo Allegrucci
2004-05-23 15:45 ` Jens Axboe
2004-05-23 16:43 ` Lorenzo Allegrucci
2004-05-23 16:56 ` Jens Axboe
2004-05-23 17:17 ` Lorenzo Allegrucci
2004-05-23 17:31 ` Jens Axboe
2004-05-23 20:41 ` Lorenzo Allegrucci [this message]
2004-05-23 8:27 ` Jens Axboe
2004-05-23 10:37 ` Kurt Garloff
2004-05-23 10:56 ` Jens Axboe
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