* e600 core power management
@ 2008-07-07 11:48 Matt Sealey
2008-07-07 18:04 ` Matt Sealey
0 siblings, 1 reply; 2+ messages in thread
From: Matt Sealey @ 2008-07-07 11:48 UTC (permalink / raw)
To: ppc-dev
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: e600 core power management
2008-07-07 11:48 e600 core power management Matt Sealey
@ 2008-07-07 18:04 ` Matt Sealey
0 siblings, 0 replies; 2+ messages in thread
From: Matt Sealey @ 2008-07-07 18:04 UTC (permalink / raw)
To: ppc-dev
I think I'll reiterate here as it got lost in my rambling, that I am wondering
if NAP is enabled *by default* and if not, why not on processors that don't
doze? (powersave-nap is 0 here)
--
Matt Sealey <matt@genesi-usa•com>
Genesi, Manager, Developer Relations
Matt Sealey wrote:
> 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?
^ permalink raw reply [flat|nested] 2+ messages in thread
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