From: Pavel Machek <pavel@suse.cz>
To: Tyson D Sawyer <tyson@rwii.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Missed jiffies
Date: Tue, 19 Feb 2002 09:25:03 +0000 [thread overview]
Message-ID: <20020219092502.A37@toy.ucw.cz> (raw)
In-Reply-To: <3C6E77DE.70FE49DF@rwii.com>
In-Reply-To: <3C6E77DE.70FE49DF@rwii.com>; from tyson@rwii.com on Sat, Feb 16, 2002 at 10:16:46AM -0500
Hi!
> My system looses about 8 seconds every 20 minutes. This is reported
> by ntp and verified by comparing 'date' to 'hwclock --show' and a wall
> clock.
>
> My system is a x86 Dell laptop with HZ=1024.
...
> Since I have defined HZ to be 1024, I miss lots of timer interrupts.
> However, since the the processor spends 18ms at a time in SMM (System
> Mangement Mode), then even the stock 10ms timer tick will sometimes
> miss a tick. Thus the problem applies to non-hacked kernels also.
Kernel cancompensate for one lost tick, AFAIR, so go back to HZ=100.
Pavel
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
prev parent reply other threads:[~2002-02-19 20:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-16 15:16 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 ` Missed jiffies H. Peter Anvin
2002-02-18 19:04 ` 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 [this message]
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