lkml.org 
[lkml]   [2016]   [Oct]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V3 00/11] block-throttle: add .high limit
Hello,

On Tue, Oct 04, 2016 at 06:22:28PM +0200, Paolo Valente wrote:
> Could you please elaborate more on this point? BFQ uses sectors
> served to measure service, and, on the all the fast devices on which
> we have tested it, it accurately distributes
> bandwidth as desired, redistributes excess bandwidth with any issue,
> and guarantees high responsiveness and low latency at application and
> system level (e.g., ~0 drop rate in video playback, with any background
> workload tested).

The same argument as before. Bandwidth is a very bad measure of IO
resources spent. For specific use cases (like desktop or whatever),
this can work but not generally.

> Could you please suggest me some test to show how sector-based
> guarantees fails?

Well, mix 4k random and sequential workloads and try to distribute the
acteual IO resources.

Thanks.

--
tejun

\
 
 \ /
  Last update: 2016-10-04 18:28    [W:0.169 / U:0.800 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site