RE: processor module locks up hyperthreading enabled machine

[Pallipadi, Venkatesh]

>-----Original Message-----
>From: Reinhard Nissl [mailto:rnissl@xxxxxx] 
>Sent: Wednesday, November 02, 2005 11:30 AM
>To: Pallipadi, Venkatesh
>Cc: linux-kernel@xxxxxxxxxxxxxxx; Brown, Len
>Subject: Re: processor module locks up hyperthreading enabled machine
>
>Hi,
>
>Pallipadi, Venkatesh wrote:
>
>> Hmmmmm.... Please try the latest patch here
>> http://bugme.osdl.org/show_bug.cgi?id=5452
>
>Your patch fixed the freeze. Tested with kernel 2.6.14.
>
>I should have mentioned, that my system is equiped with a 
>Fujitsu-Siemens Mainboard D1562-A2, most recent BIOS V4.06 R1.09.
>
>I'll try to get this bug fixed in the BIOS, but chances are not that 
>good as the board is already "quite old".
>
>Would you please be so kind and drop a few lines about the 
>drawbacks of 
>this BIOS bug? What kind of functionality is lost by "ignoring" the 
>second CPU at this particular code section?
>

It will basically disable ACPI Processor Power Management features. 
P-state (speedstep or dynamic change of frequency to save power) and
C-states beyond C1 and T-states. 
>From dmesg, I know that on your system C2 and beyond is not supported.
T-states are kind of unimportantish. Only other difference will be
P-state. Not sure whether your processor supports speedstep and dynamic
change of cpufreq. If it doesn't, then you won't loose anything by this
workaround.

Thanks,
Venki
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