From: Jeff Sipek <jeffpc@optonline.net>
To: Hans Kristian Rosbach <hk@isphuset.no>
Cc: linux-kernel@vger.kernel.org
Subject: Re: SMP cpu deep sleep
Date: Fri, 20 Aug 2004 04:58:29 -0400 [thread overview]
Message-ID: <200408200458.38591.jeffpc@optonline.net> (raw)
In-Reply-To: <1092989207.18275.14.camel@linux.local>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Friday 20 August 2004 04:06, Hans Kristian Rosbach wrote:
> While reading through hotplug and speedstep patches
> I came to think of a feature I think might be useful.
>
> In an SMP system there are several cpus, this generates
> extra heat and power consuption even on idle load.
> Is there a way to put all cpus but cpu1 into a kind of
> deep sleep? Cpu1 would have to do all work (including irqs)
> of course.
With Rusty's Hotplug CPU, a userspace script should be able to do this by
cat'ing 1 or 0 into the appropriate sysfs file.
Jeff.
- --
"If I have trouble installing Linux, something is wrong. Very wrong."
- Linus Torvalds
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.5 (GNU/Linux)
iD8DBQFBJb08wFP0+seVj/4RAotfAJ9gvudaaAQbYjSiky78rkkRnlZHAACfb8oR
Whj349hrd6ZnUPf27JwjJxY=
=mL1E
-----END PGP SIGNATURE-----
next prev parent reply other threads:[~2004-08-20 9:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-20 8:06 SMP cpu deep sleep Hans Kristian Rosbach
2004-08-20 8:58 ` Jeff Sipek [this message]
2004-08-20 9:42 ` Hans Kristian Rosbach
2004-08-20 14:38 ` Zwane Mwaikambo
2004-08-20 16:44 ` Wes Felter
2004-08-21 0:53 ` Benjamin Herrenschmidt
2004-08-23 21:30 ` Bill Davidsen
2004-08-28 19:15 ` Alan Cox
2004-08-24 22:48 ` Pavel Machek
-- strict thread matches above, loose matches on Subject: below --
2004-08-20 14:30 Nakajima, Jun
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=200408200458.38591.jeffpc@optonline.net \
--to=jeffpc@optonline.net \
--cc=hk@isphuset.no \
--cc=linux-kernel@vger.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.