Messages in this thread | | | Subject | RE: processor module locks up hyperthreading enabled machine | Date | Thu, 3 Nov 2005 20:05:08 -0800 | From | "Pallipadi, Venkatesh" <> |
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>-----Original Message----- >From: Reinhard Nissl [mailto:rnissl@gmx.de] >Sent: Wednesday, November 02, 2005 11:30 AM >To: Pallipadi, Venkatesh >Cc: linux-kernel@vger.kernel.org; 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.
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