From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: roderik.wildenburg@domain.hid
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Xenomai 2.5.6 with PPC-Kernel 2.4.25
Date: Tue, 21 Jun 2011 13:33:08 +0200 [thread overview]
Message-ID: <4E008174.2060305@domain.hid> (raw)
In-Reply-To: <3FF315C710820E47A04E55C6F7D9B0AD7FECF6@domain.hid>
On 06/21/2011 01:22 PM, roderik.wildenburg@domain.hid wrote:
>> 2% off seems a lot for a transient load, and this would not happen on a
>> periodic basis anyway. This needs to be investigated. Could you run
>> switchtest in nofpu mode?
>
> Still fluctuates about 2% (see !! mark) but now more erratic. The reduced number of context switches is caused by the reduced number of tasks?
switchest works by switching context between several tasks. One of this
task does sleep, in order to avoid starving linux, and also prints the
numbers approximately every second.
When there are less task, we enter the sleeping task more often, so,
yes, there are less context switches.
But more importantly, since, the time when we print the result is so
imprecise, some variations are normal, so, chances are that the 2%
variation is normal.
--
Gilles.
next prev parent reply other threads:[~2011-06-21 11:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-14 8:52 [Xenomai-help] Xenomai 2.5.6 with PPC-Kernel 2.4.25 roderik.wildenburg
2011-06-14 9:39 ` Philippe Gerum
2011-06-14 12:47 ` roderik.wildenburg
2011-06-18 8:50 ` Philippe Gerum
2011-06-18 13:44 ` Gilles Chanteperdrix
2011-06-18 14:21 ` Philippe Gerum
2011-06-21 10:04 ` roderik.wildenburg
2011-06-21 10:35 ` Philippe Gerum
2011-06-21 11:22 ` roderik.wildenburg
2011-06-21 11:33 ` Gilles Chanteperdrix [this message]
2011-06-21 13:05 ` roderik.wildenburg
2011-06-21 13:15 ` Philippe Gerum
2011-06-21 13:51 ` roderik.wildenburg
2011-06-21 14:05 ` Gilles Chanteperdrix
2011-06-21 14:35 ` Philippe Gerum
2011-07-03 15:48 ` Philippe Gerum
2011-07-04 9:43 ` roderik.wildenburg
2011-06-18 14:35 ` Philippe Gerum
2011-06-18 14:44 ` Philippe Gerum
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E008174.2060305@domain.hid \
--to=gilles.chanteperdrix@xenomai.org \
--cc=roderik.wildenburg@domain.hid \
--cc=xenomai@xenomai.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.