Messages in this thread | | | Date | Tue, 9 Apr 2013 10:57:53 -0700 | From | Tejun Heo <> | Subject | Re: dm-crypt parallelization patches |
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On Tue, Apr 09, 2013 at 01:51:43PM -0400, Mikulas Patocka wrote: > The patch dm-crypt-sort-requests.patch sorts write requests submitted by a > single thread. The requests are sorted according to the sector number, > rb-tree is used for efficient sorting.
Hmmm? Why not just keep the issuing order along with plugging boundaries?
> So it seems that CFQ has some deficiency that it cannot merge adjacent > requests done by different processes.
As I wrote before, please use bio_associate_current(). Currently, dm-crypt is completely messing up all the context information that cfq depends on to schedule IOs. Of course, it doesn't perform well.
Thanks.
-- tejun
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