lkml.org 
[lkml]   [2009]   [Mar]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectImproving IPMI performance under load
Hi Corey,

yesterday I posted some results about the IPMI performance under CPU
load, which can be up to 25 times slower than in an idle system. I think
it might be worthwhile to try to improve that behavior as well.

I made a variation of my patch which introduces a second parameter
(kipmid_min_busy) that causes kipmid not to call schedule() for a
certain amount of time. Thus if there's IPMI traffic pending, kipmid
will busy-loop for kipmid_min_busy seconds, then starting to schedule()
in each loop as it does now, and finally go to sleep when
kipmid_max_busy is reached. At the same time, I changed the nice value
of kipmid from 19 to 0.

With this patch and e.g. min_busy=100 and max_busy=200, there is no
noticeable difference any more between IPMI performance with and without
CPU load.

The patch + results still need cleanup, therefore I am not sending it
right now. Just wanted to hear what you think.

Martin

--
Martin Wilck
PRIMERGY System Software Engineer
FSC IP ESP DEV 6

Fujitsu Siemens Computers GmbH
Heinz-Nixdorf-Ring 1
33106 Paderborn
Germany

Tel: ++49 5251 525 2796
Fax: ++49 5251 525 2820
Email: mailto:martin.wilck@fujitsu-siemens.com
Internet: http://www.fujitsu-siemens.com
Company Details: http://www.fujitsu-siemens.com/imprint.html


\
 
 \ /
  Last update: 2009-03-24 10:33    [W:0.769 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site