RE: [2.6.12] x86-64 IO-APIC + timer doesn't work

From: Pallipadi, Venkatesh
Date: Sat Jun 18 2005 - 23:59:23 EST

>-----Original Message-----
>From: Andi Kleen [mailto:ak@xxxxxx]
>Sent: Saturday, June 18, 2005 6:34 PM
>To: Alistair John Strachan
>Cc: linux-kernel@xxxxxxxxxxxxxxx; ACurrid@xxxxxxxxxx;
>Pallipadi, Venkatesh
>Subject: Re: [2.6.12] x86-64 IO-APIC + timer doesn't work
>> Despite the fact that this wasn't documented in the BIOS
>update, an update for
>> my board (MS-7030 Neo Platinum by MSI) supposedly fixing
>"Fan Function"
>> actually corrects the IO-APIC and NMI bugs. I now get the
>following in dmesg
>> instead:
>> Calibrating delay loop... 3973.12 BogoMIPS (lpj=1986560)
>> Mount-cache hash table entries: 256
>> CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
>> CPU: L2 Cache: 512K (64 bytes/line)
>> CPU: AMD Athlon(tm) 64 Processor 3000+ stepping 00
>> Using local APIC timer interrupts.
>> Detected 12.561 MHz APIC timer.
>> testing NMI watchdog ... OK.
>> So I'm a happy man. Whether this is at all related to the
>problems I was
>> having before, I don't really know. If the problem doesn't
>reoccur, I could
>> very well have wasted your time.
>Hmm - I suspect I know what's happening. The older BIOS
>probably had some long
>running SMM code that breaks the BogoMips computation occasionally
>and that breaks the timer check later which relies on usable BogoMips.
>There was a patch for that from Venkatesh (because it showed on some
>other machines too), but it didn't seem to have made it into 2.6.12
>Venkatesh, can you push your calibrate_delay patch please? ?

That patch is in mm tree.

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