lkml.org 
[lkml]   [2010]   [Nov]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 08/13] writeback: quit throttling when bdi dirty pages dropped low
From
Date
On Wed, 2010-11-24 at 20:30 +0800, Wu Fengguang wrote:
>
> For the 1-dd case, it looks better to lower the break threshold to
> 125ms. After all, it's not easy for the dirty pages to drop by 250ms
> worth of data when you only slept 200ms (note: the max pause time has
> been doubled mainly for servers).
>
> - if (nr_dirty < dirty_thresh &&
> - bdi_prev_dirty - bdi_dirty > (long)bdi->write_bandwidth / 4)
> + if (nr_dirty <= dirty_thresh &&
> + bdi_prev_dirty - bdi_dirty > (long)bdi->write_bandwidth / 8)
> break;

Hrm, but 125ms worth in 200ms is rather easy, you'd want to keep that
limit above what the pause should give you, right?



\
 
 \ /
  Last update: 2010-11-24 13:49    [W:0.112 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site