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The cpuidle subsystemThe cpuidle subsystemPosted Apr 27, 2010 21:23 UTC (Tue) by nix (subscriber, #2304)In reply to: The cpuidle subsystem by intgr Parent article: The cpuidle subsystem
It's got nothing to do with Intel versus AMD. One of my Nehalem machines reports that message: it's just because C states are turned off in the BIOS.
I suspect it needs some word-wrapping: the 'available' has been overwritten by the P-state heading :)
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The cpuidle subsystem Posted Apr 28, 2010 11:53 UTC (Wed) by nye (guest, #51576) [Link]
>I suspect it needs some word-wrapping: the 'available' has been overwritten by the P-state heading :)
Since it always says that, no matter how wide the terminal in which it's run, you'd think somebody who knows that the message has been truncated would have noticed at some point and fixed it. I just assumed it was a message in some arcane code known to those deeply involved in power usage monitoring :P.
Anyway it's unfortunate that desktop CPUs don't support this - even the Atom (D510) I bought a month ago only supports C0 and C1, and I don't know if it's possible to tell how long it's spending in what state. It seems you need CPUs designed specifically for battery-powered devices if you want anything more.
The cpuidle subsystem Posted Apr 28, 2010 12:16 UTC (Wed) by hmh (subscriber, #3838) [Link]
Many desktop CPUs do support it. Your BIOS might not. Your particular CPU might not (or might be buggy and the BIOS went ahead and disabled it for safety). But it is not a rare feature in desktop CPUs anymore.
The cpuidle subsystem Posted Apr 28, 2010 14:11 UTC (Wed) by nye (guest, #51576) [Link]
Is there anywhere a list of supporting processors? I was hoping that a site like lesswatts.org might have that sort of thing, but I couldn't find that information anywhere short of downloading the datasheets for every individual CPU, and of course there are a near-infinite selection of CPUs on offer nowadays.
However, if even brand new all-in-one Atom systems don't support this - given that they're targetted specifically at low-power uses - it doesn't seem to be a stretch to conclude that this is something that manufacturers basically don't care about.
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