From: Jens Axboe <jens.axboe@oracle.com>
To: Eric Sandeen <sandeen@sandeen.net>
Cc: Milan Broz <mbroz@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Ric Wheeler <rwheeler@redhat.com>,
"MASON,CHRISTOPHER" <CHRIS.MASON@oracle.com>
Subject: Re: Mount ext3 with barrier=1 doesn't send real barrier bio?
Date: Thu, 21 Aug 2008 07:26:05 +0200 [thread overview]
Message-ID: <20080821052604.GM20055@kernel.dk> (raw)
In-Reply-To: <48ACAADD.2010104@sandeen.net>
On Wed, Aug 20 2008, Eric Sandeen wrote:
> Milan Broz wrote:
> > Hi,
> >
> > I run some barrier tests over device-mapper (which currently doesn't
> > support barrier bio at all) and even if I set barrier=1 in ext3 mount,
> > there is never any bio with barrier flag... (in 2.6.27-rc)
> >
> > How is the barrier=1 flag supposed to work in ext3 (JBD) now?
>
> Milan, you're right. Ric saw this same strange behavior when doing some
> benchmarking with and without barriers; Chris noticed the change in
> submit_bh; I was about to write up a similar patch to what you've sent
> already. Jens, does Milan's fix look good to you?
Yep looks good, thanks a lot Milan! I'll send in the patch, unless I'm
badly mistaken we need it for 2.6.26-stable as well.
--
Jens Axboe
next prev parent reply other threads:[~2008-08-21 5:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-15 21:31 Mount ext3 with barrier=1 doesn't send real barrier bio? Milan Broz
2008-08-20 23:38 ` Eric Sandeen
2008-08-21 5:26 ` Jens Axboe [this message]
2008-08-21 10:43 ` Ric Wheeler
2008-08-21 22:23 ` OGAWA Hirofumi
2008-08-22 6:38 ` Jens Axboe
2008-08-22 7:45 ` OGAWA Hirofumi
2008-08-22 7:58 ` Jens Axboe
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