From: Jeff Dike <jdike@addtoit.com>
To: Hrishikesh <hrishikesh.amur@gmail.com>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Dramatic drop in C3 state residency with NO_HZ patches
Date: Wed, 17 Oct 2007 11:55:04 -0400 [thread overview]
Message-ID: <20071017155504.GD9497@c2.user-mode-linux.org> (raw)
In-Reply-To: <1f154f440710161936h4800b0c5nb3140ff504212625@mail.gmail.com>
On Tue, Oct 16, 2007 at 10:36:39PM -0400, Hrishikesh wrote:
> When running powertop, I notice that there is a dramatic drop in C3 state
> residency when running the patched kernel. This happens when you run a
> patched kernel but without the NO_HZ and HR timers options disabled. C3
> state residency drops from about 90% to 50% when the UML kernel is idle.
> This does not happen when the tickless option _is_ enabled.
Which kernel is the patched kernel, the host or UML?
Whichever kernel this is, I take it that this is a bad thing?
Jeff
--
Work email - jdike at linux dot intel dot com
-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems? Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
next prev parent reply other threads:[~2007-10-17 15:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-17 2:36 [uml-devel] Dramatic drop in C3 state residency with NO_HZ patches Hrishikesh
2007-10-17 15:55 ` Jeff Dike [this message]
2007-10-17 16:16 ` Hrishikesh
2007-10-17 17:19 ` Jeff Dike
2007-10-17 19:43 ` Hrishikesh
2007-10-17 20:45 ` Jeff Dike
2007-10-17 23:29 ` Hrishikesh
2007-10-18 20:04 ` Jeff Dike
2007-10-23 19:21 ` Hrishikesh
2007-10-23 21:35 ` Jeff Dike
2007-10-23 23:53 ` Hrishikesh
2007-10-18 8:06 ` Hrishikesh
2007-11-06 18:02 ` Jeff Dike
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=20071017155504.GD9497@c2.user-mode-linux.org \
--to=jdike@addtoit.com \
--cc=hrishikesh.amur@gmail.com \
--cc=user-mode-linux-devel@lists.sourceforge.net \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox