From: Neil Brown <neilb@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Lars Ellenberg <Lars.Ellenberg@linbit.com>,
Ingo Molnar <mingo@redhat.com>,
linux-raid@vger.kernel.org, Jens Axboe <jens.axboe@oracle.com>,
stable@kernel.org
Subject: Re: [patch] md: pass down BIO_RW_SYNC in raid{1,10}
Date: Tue, 9 Jan 2007 10:50:40 +1100 [thread overview]
Message-ID: <17826.55504.264610.856196@notabene.brown> (raw)
In-Reply-To: message from Andrew Morton on Monday January 8
On Monday January 8, akpm@osdl.org wrote:
> On Mon, 8 Jan 2007 10:08:34 +0100
> Lars Ellenberg <Lars.Ellenberg@linbit.com> wrote:
>
> > md raidX make_request functions strip off the BIO_RW_SYNC flag,
> > thus introducing additional latency.
> >
> > fixing this in raid1 and raid10 seems to be straight forward enough.
> >
> > for our particular usage case in DRBD, passing this flag improved
> > some initialization time from ~5 minutes to ~5 seconds.
>
> That sounds like a significant fix.
>
> This patch also applies to 2.6.19 and I have tagged it for a -stable
> backport. Neil, are you OK with that?
Yes, I'm OK with that, thanks.
NeilBrown
next prev parent reply other threads:[~2007-01-08 23:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-08 9:08 [patch] md: pass down BIO_RW_SYNC in raid{1,10} Lars Ellenberg
2007-01-08 23:02 ` Andrew Morton
2007-01-08 23:50 ` Neil Brown [this message]
2007-01-09 7:12 ` Jens Axboe
2007-01-09 14:08 ` Lars Ellenberg
2007-01-09 16:13 ` Mike Snitzer
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