From: Jens Axboe <axboe@suse.de>
To: Lorenzo Allegrucci <l_allegrucci@despammed.com>
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 17:45:24 +0200 [thread overview]
Message-ID: <20040523154524.GR1952@suse.de> (raw)
In-Reply-To: <200405231732.15600.l_allegrucci@despammed.com>
On Sun, May 23 2004, Lorenzo Allegrucci wrote:
> On Sunday 23 May 2004 12:03, Jens Axboe wrote:
>
> > Here's a rolled up updated version that tries to get async notification
> > of missing barrier support working as well. reiser currently doesn't
> > cope with that correctly (fails mount), ext3 seems to but gets stuck.
> > Andrew has that fixed already, I think :-)
> >
> > Lorenzo, can you test this on top of 2.6.6-mm5?
>
> Problem fixed, but there is some performance regression
>
> ext3 (default)
> untar read copy remove
> 0m53.861s 0m24.942s 1m30.164s 0m20.664s
> 0m7.132s 0m1.191s 0m0.766s 0m0.076s
> 0m5.807s 0m3.345s 0m9.996s 0m1.719s
>
> ext3 (-o barrier=1)
> untar read copy remove
> 0m52.117s 0m28.502s 1m51.153s 0m25.561s
> 0m7.231s 0m1.209s 0m0.738s 0m0.071s
> 0m6.117s 0m3.191s 0m9.347s 0m1.635s
Not sure what you mean here, but yes of course -o barrier=1 is going to
be slower than default + write back caching. What you should compare is
without barrier support and hdparm -W0 /dev/hdX, if -o barrier=1 with
caching on is slower then that's a regression :-)
--
Jens Axboe
next prev parent reply other threads:[~2004-05-23 15:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-22 19:07 2.6.6-mm5 oops mounting ext3 or reiserfs with -o barrier 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 [this message]
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
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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