Date: Wed, 10 Mar 2004 21:20:25 +0100
From: Jens Axboe <axboe@suse.de>
To: Kenneth Chen <kenneth.w.chen@intel.com>
Cc: "'Andrew Morton'" <akpm@osdl.org>, linux-kernel@vger.kernel.org,
       thornber@redhat.com
Subject: Re: [PATCH] backing dev unplugging
Message-ID: <20040310202025.GH15087@suse.de>
References: <20040310115545.16cb387f.akpm@osdl.org> <200403102003.i2AK3qm16576@unix-os.sc.intel.com>
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On Wed, Mar 10 2004, Kenneth Chen wrote:
> Andrew Morton wrote on Wednesday, March 10, 2004 11:56 AM
> > Jens Axboe <axboe@suse.de> wrote:
> > >
> > > Here's a first cut at killing global plugging of block devices to reduce
> > > the nasty contention blk_plug_lock caused. This introduceds per-queue
> > > plugging, controlled by the backing_dev_info.
> >
> > This is such an improvement over what we have now it isn't funny.
> >
> > Ken, the next -mm is starting to look like linux-3.1.0 so I think it
> > would be best if you could benchmark Jens's patch against 2.6.4-rc2-mm1.
> 
> I'm planning on couple experiments: one is just Jens's change on top of
> what we have so we can validate the backing dev unplug. Then we will run
> 2.6.4-rc2-mm1 + Jens's patch.

It'll be hard to apply the patch against anything but -mm, since it
builds (or at least will conflict with) other changes in there. I
deliberately made a -mm version this time though I usually make -linus
and adapt if necessary, for Andrew to get some testing on this.

-- 
Jens Axboe

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