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SubjectLoosing timer interrupts with ACPI
Date
When periodically reading /proc/acpi/battery/BAT0/info (once 
per second), running "adjtimex --compare=10000" indicates
slight slowing down of the system clock. It seems that
reading battery info may lead to loosing timer interrupts.

System: Compaq Presario 900Z notebook
Kernel: 2.4.21-ac1

First time the system clock drift was noticed when running
akpi applet for KDE: ntpdate time corrections were too
large. Then I've found that it happens when simply

To test this, run

adjtimex --compare=10000

in first xterm, and the following script on another xterm:

#!/bin/sh

for i in `find /proc/acpi/battery -type f`
do
echo $i
count=0
while [ $count -lt 30 ]
do
cat $i > /dev/null 2>/dev/null
sleep 1
count=$[count+1]
done
done

Serguei Miridonov.

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