From: Nicolas Capit <capitn@free.fr>
To: Len Brown <lenb@kernel.org>
Cc: cpufreq@lists.linux.org.uk
Subject: Re: ondemand: cpu load calculation with kernel processus
Date: Thu, 31 May 2007 20:57:51 -0500 [thread overview]
Message-ID: <20070531205751.2f56da4d@localhost.localdomain> (raw)
In-Reply-To: <200705312057.45963.lenb@kernel.org>
On Thu, 31 May 2007 20:57:45 -0400
Len Brown <lenb@kernel.org> wrote:
> On Thursday 31 May 2007 17:57, Nicolas Capit wrote:
> > Hello,
> >
> > I am running a Debian unstable with a kernel 2.6.21-1-686 and using
> > modules powernow_k8 and cpufreq_ondemand.
> >
> > My configuration with the ondemand governor seems to work very well
> > except when my cpu is busy by the kernel processus kcryptd. The cpu is
> > 100% busy but the frequency is not increased.
> > (I am using the module dm_crypt to encrypt my home filesystem)
> >
> > So my question is:
> > Does the ondemand governor calculate the load of the machine with user
> > level and *kernel* level processus?
>
> both user and kernel time should count as busy time.
>
> do the cpu stats exposed by top show that you have idle time available?
Ok I am sorry for the noise :-(
My program that get the CPU stats is buggy... with top, effectively the
CPU is 0% idle but 10%us and 90%wa
(wa : Amount of time the CPU has been waiting for I/O to complete.)
Except if increasing the CPU frequency will reduce I/O wait time, the
cpufreq_ondemand works well...
>
> -Len
>
prev parent reply other threads:[~2007-06-01 1:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-31 21:57 ondemand: cpu load calculation with kernel processus Nicolas Capit
2007-06-01 0:57 ` Len Brown
2007-06-01 1:57 ` Nicolas Capit [this message]
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=20070531205751.2f56da4d@localhost.localdomain \
--to=capitn@free.fr \
--cc=cpufreq@lists.linux.org.uk \
--cc=lenb@kernel.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.