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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20040523154524.GR1952@suse.de \
--to=axboe@suse.de \
--cc=akpm@osdl.org \
--cc=l_allegrucci@despammed.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.