[lkml]   [2002]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Missed jiffies
"H. Peter Anvin" wrote:
> Followup to: <>
> By author: george anzinger <>
> In newsgroup:
> >
> > One of the nasty problems, especially with machines such as yours (i.e.
> > lap tops), is the fact that TSC is NOT clocked at a fixed rate. It is
> > affected by throttling (reduced in 12.5% increments) and by power
> > management.
> If the TSC is affected by HLT, throttling, or C2 power management, the
> TSC is broken (as it is on Cyrix chips, for example.) The TSC usually
> *is* affected by C3 power management, but the OS should be aware of
> C3.
> -hpa
Gosh I would LIKE to think this is true. Could you give a reference? I
believe Andrew Grover thinks that what I have stated is true. If I am
wrong, it will make the high-res-timers MUCH more acceptable as the TSC
overhead is MUCH lower that the ACPI pm timer.

Do I have this right Andrew?
Real time sched:
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:24    [W:0.111 / U:44.248 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site