lkml.org 
[lkml]   [2013]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: dm-crypt parallelization patches
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


\
 
 \ /
  Last update: 2013-04-09 20:41    [W:0.065 / U:1.820 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site