Re: Missed jiffies

H. Peter Anvin (hpa@zytor.com)
17 Feb 2002 14:48:18 -0800

Followup to: <3C6E833F.1A888B3C@mvista.com>
By author: george anzinger <george@mvista.com>
In newsgroup: linux.dev.kernel
>
> 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

-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/