Messages in this thread | | | Date | Mon, 27 Feb 2006 00:37:45 +0100 | From | Johannes Stezenbach <> | Subject | Re: Status of X86_P4_CLOCKMOD? |
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On Sun, Feb 26, 2006, Dominik Brodowski wrote: > On Sun, Feb 26, 2006 at 09:39:41PM +0100, Johannes Stezenbach wrote: > > > > Do you have the numbers for a Pentium(R) 4 HT? (I couldn't find > > anything substantial with google.) Especially C2 vs. C2 + throttling? > > Because the way I remember having read somewhere, the idle > > (C2) power consumption of the P4 is significantly higher > > than with the Pentium(R) M. > > Unfortunately, I do not have these numbers present. You can check the > processor specification sheets at Intel's website, though.
Went to the Intel(R) website, searched for half an hour, found many docs but none that gives useful information about this, gave up. :-(
> > > So: P4-clockmod style throttling only makes sense if either > > > > > > a) the idle handler does not enter the Stop-Grant state (C2) efficiently, or > > > > Maybe my previous mails were not clear enough: The goal is to > > reduce idle power consumption (and by that fan noise). The PC > > is running but is idle, e.g just listening for possible incoming > > jabber messages or whatever. > > Most probably, the idle handler can't make use of the Stop-Grant state (C2) > here, so this is case a) noted above.
Hm.
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