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From"Kenneth Chen" <>
SubjectRE: [PATCH] backing dev unplugging
DateSun, 14 Mar 2004 21:53:58 -0800
>>>>>> Andrew Morton on Wed 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.


Our latest measurement on the 32P, 1000 disks setup indicates this patch
is working as expected performance wise.  We saw 200% improvement on the
throughput compare to global blk_plug_list.  (compare to the per-cpu
blk_plug_list, performance is the same).

- Ken


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