Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3

Marc Ballarin
2005-08-04T22:14:23Z

On Wed, 3 Aug 2005 15:59:24 +1000
Con Kolivas <kernel@kolivas.org> wrote:

> This is the dynamic ticks patch for i386 as written by Tony Lindgen
> <tony@atomide.com> and Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
> Patch for 2.6.13-rc5

One issue (tested the -rc4 Version on -mm):
- on interrupt flood (ping -f) HZ goes down to 0-4 HZ.
This matches "ticks to skip" below. Coincidence?

- ping -f complains:
.Warning: time of day goes back (-304us), taking countermeasures.
...
.Warning: time of day goes back (-33us), taking countermeasures.

Yet, system time _seems_ to be kept correctly.

CPU is Pentium M.

dmesg:
Using pmtmr for high-res timesource
dyn-tick: Found suitable timer: pmtmr

dyn-tick: Maximum ticks to skip limited to 54
dyn-tick: Timer not enabled during boot

sysfs:
suitable: 1
enabled: 1
using APIC: 0

Regards