linux-kernel - Re: [PATCH] aoe: end barrier bios with EOPNOTSUPP

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Message-ID: <20090910195021.GW18599@kernel.dk>
Date:	Thu, 10 Sep 2009 21:50:21 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ed Cashin <ecashin@...aid.com>
Cc:	alan@...rguk.ukuu.org.uk, akpm@...ux-foundation.org,
	apw@...onical.com, bonbons@...ux-vserver.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] aoe: end barrier bios with EOPNOTSUPP

On Thu, Sep 10 2009, Ed Cashin wrote:
> On Thu Sep 10 03:48:22 EDT 2009, jens.axboe@...cle.com wrote:
> > On Wed, Sep 09 2009, Ed Cashin wrote:
> ...
> > > If I had a reproducable problem case that the barrier implementation
> > > could fix, it would be very helpful.
> > 
> > Depending on timing and the other end, it may not be easy to reproduce.
> > But the problem is indeed real, so I think you should just add the
> > proper barrier implementation instead of spending too much time trying
> > to create a reproducable problem. By the time you get there, you could
> > have fixed it many times over :-)
> 
> OK. I will start work on it.  But if anybody can give me a torture
> test that works on aoe devices, I'll be grateful.
> 
> I think the EOPNOTSUPP patch is good for the for-next aoe quilt tree,
> while the new barrier support will be good for 2.6.32.

.31 is already out, so there's plenty of time to fix it for .32 for
real. I don't mind putting in the temporary fix in the mean time,
though.

-- 
Jens Axboe

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