From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Missed jiffies
Date: 17 Feb 2002 14:48:18 -0800 [thread overview]
Message-ID: <a4pbvi$iq2$1@cesium.transmeta.com> (raw)
In-Reply-To: <3C6E77DE.70FE49DF@rwii.com> <3C6E833F.1A888B3C@mvista.com>
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>
next prev parent reply other threads:[~2002-02-17 22:49 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-16 15:16 Missed jiffies Tyson D Sawyer
2002-02-16 16:05 ` george anzinger
2002-02-16 16:14 ` yodaiken
2002-02-16 17:11 ` Alan Cox
2002-02-17 2:18 ` disregard lee johnson
2002-02-17 22:48 ` H. Peter Anvin [this message]
2002-02-18 19:04 ` Missed jiffies george anzinger
2002-02-18 19:22 ` H. Peter Anvin
2002-02-18 19:33 ` Alan Cox
[not found] ` <a4pbvi@cesium.transmeta.com>
2002-02-19 9:30 ` Pavel Machek
2002-02-19 20:23 ` H. Peter Anvin
2002-02-16 16:46 ` Alan Cox
2002-02-16 18:44 ` Eric W. Biederman
2002-02-16 19:02 ` george anzinger
2002-02-19 9:25 ` Pavel Machek
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