RE: x86 TSC time warp puzzle

[Jonathan Lundell]

At 3:13 AM -0500 4/2/05, Lee Revell wrote:
> On Fri, 2005-04-01 at 23:05 -0800, Pallipadi, Venkatesh wrote:
> >  It can be SMI happening in the platform. Typically BIOS uses some SMI
>  > polling to handle some devices during early boot. Though 500 
> microseconds > sounds a bit too high.
>
> Nope, that sounds just about right.  Buggy BIOSes that implement ACPI
> via SMM (or so I have been told) can stall the machine for over a
> millisecond, this is why some laptops lose timer ticks at HZ=1000.  The
> issue is well known by Linux audio users, as it causes big problems for
> people who buy laptops for live audio use.

This is a desktop board, and this is well after boot (hours). Also, 
ACPI is disabled in the BIOS.

I suppose I can try to disable SMI via the APIC?
--
/Jonathan Lundell.
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