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Re: [PATCH] backing dev unplugging

From:  Andrew Morton <akpm-AT-osdl.org>
To:  Jens Axboe <axboe-AT-suse.de>
Subject:  Re: [PATCH] backing dev unplugging
Date:  Wed, 10 Mar 2004 11:55:45 -0800
Cc:  linux-kernel-AT-vger.kernel.org, kenneth.w.chen-AT-intel.com, thornber-AT-redhat.com

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.
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