On Tue, Apr 29, 2014 at 11:36 AM, ron minnich <rminn...@gmail.com> wrote:
> Anybody out there know typical numbers for the timer tick if USB is > active as part of SMM? > > I just heard one number for one product line, 8 HZ. We're seeing a > mysterious 18 HZ tick on one system. Any other numbers people know? > 18.2 Hz is legacy stuff, http://wiki.osdev.org/Programmable_Interval_Timer- but the particulars of an SMM implementation might just as well be a copy-paste error, for all I know. An OHCI driver might use a timer tick to recover after a timeout. The USB spec doesn't specify all the timeouts, though multiples of 100ms are common (so a ~10HZ timer might be useful). Hope that helps, David
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