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.
A list of known good/bad machines would be a tremendous help, but no one
knows the exact extent of the problem. All Acer laptops seem to be
affected.
Hardware manufacturers (laptops anyway) don't seem to care about
anything below 1-2ms because Windows uses HZ=100 and the ASIO drivers on
that platform only go down to about ~1.5 ms latency.
Lee
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