Messages in this thread | | | From | Thomas Renninger <> | Subject | Re: cpuinfo shows wrong MHz value | Date | Mon, 16 Feb 2009 19:13:15 +0100 |
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On Monday 16 February 2009 17:50:08 Matthew Garrett wrote: > On Mon, Feb 16, 2009 at 02:19:50PM +0000, Thomas Renninger wrote: > > > There should be a message when this driver is loaded like: > > "This driver is broken. Don't use it, don't complain." > > Please don't. It's perfectly valid (if dumb) for machines to depend on > the CPU for passive cooling even if they don't expose any P or T states. No it's not valid. If the BIOS does not export these, it could be for a reason.
> In that case p4-clockmod is the only code that can manage it. The > removal of the user-visible cpufreq interface should be a strong enough > hint that it's not intended for speed control. AFAIK p4-clockmode is still not synchronized with ACPI throttling? Thus this driver will destroy a valid machine setup where the BIOS exports throttling states via ACPI. The driver is broken (and rather useless) and all the complaints about it get annoying.
I wonder how dangerous it even is. If thermal management on a P4 is properly implemented via "BIOS throws high temperature MCE and throttles the CPU itself", could the p4_clockmode driver override the BIOS/HW settings and still run unthrottled? Danger!
Anyway, I better do not answer on p4_clockmode complaints anymore and simply delete them, it's just a waste of time.
Thomas
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