From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: SMP cpu deep sleep
Date: Sat, 28 Aug 2004 20:15:45 +0100 [thread overview]
Message-ID: <1093354219.2810.25.camel@localhost.localdomain> (raw)
In-Reply-To: <cgdn8t$l27$1@gatekeeper.tmr.com>
On Llu, 2004-08-23 at 22:30, Bill Davidsen wrote:
> For power saving, HLT is hard to beat ;-) You note HLT as if there was
> some good reason not to use it...
On a large number of processors HLT has only small effect because the
processor still has to do bus arbitration , still has large leakage
currents and has other circuitry running. The PowerNow stuff seems to
make a much bigger difference but has limits to how low you can go.
next prev parent reply other threads:[~2004-08-28 20:37 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
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 [this message]
2004-08-24 22:48 ` Pavel Machek
-- strict thread matches above, loose matches on Subject: below --
2004-08-20 14:30 Nakajima, Jun
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