Messages in this thread | | | From | "Kenneth Chen" <> | Subject | RE: [PATCH] backing dev unplugging | Date | Sun, 14 Mar 2004 21:53:58 -0800 |
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>>>>>> 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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