linux-kernel - Re: BTRFS: Unbelievably slow with kvm/qemu

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Message-ID: <20100712134911.GC15754@dhcp231-156.rdu.redhat.com>
Date:	Mon, 12 Jul 2010 09:49:11 -0400
From:	Josef Bacik <josef@...hat.com>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Josef Bacik <josef@...hat.com>,
	Giangiacomo Mariotti <gg.mariotti@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>
Subject: Re: BTRFS: Unbelievably slow with kvm/qemu

On Mon, Jul 12, 2010 at 05:42:04PM +0400, Michael Tokarev wrote:
> Josef Bacik wrote:
> []
> > O_DIRECT support was just introduced recently, please try on the latest kernel
> > with the normal settings (which IIRC uses O_DIRECT), that should make things
> > suck alot less.  Thanks,
> 
> Um.  Do you mean it were introduced in BTRFS or general? :)
> 
> Because, wel, O_DIRECT is here and supported since some 2.2 times... ;)

Btrfs obviously.

Josef
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