From: Matt Sealey <matt@genesi-usa•com>
To: ppc-dev <linuxppc-dev@ozlabs•org>
Subject: e600 core power management
Date: Mon, 07 Jul 2008 12:48:09 +0100 [thread overview]
Message-ID: <48720279.6010904@genesi-usa.com> (raw)
Hi guys,
Quick question, am I right (and looking at idle_6xx.S, I think I am) in thinking that
during the idle process, by default, an e600 core such as the 7448 or MPC8610 will
automatically transition to a NAP state, thus being as low power as possible?
Has anyone done any benchmarking of the power consumption of the processor when
this transition is disabled (remove CPU_FTR_MAYBE_CAN_NAP) or have a rough idea
what the benefits might be?
Is there a performance reason for removing the feature or disabling naps altogether?
The powersave-nap sysctl controls whether DOZE or NAP is entered on processors that
support a seperate HID0[DOZE], however is it possible to extend it such that nap
is never entered?
--
Matt Sealey <matt@genesi-usa•com>
Genesi, Manager, Developer Relations
next reply other threads:[~2008-07-07 11:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-07 11:48 Matt Sealey [this message]
2008-07-07 18:04 ` e600 core power management Matt Sealey
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