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I noticed that my system (14.2) would very often hang for a couple of seconds when reading or writing RTC, when booting or shutting down.
It turned out that, if I set RTC wakeup alarm, then that causes hangs on /sbin/hwclock.
I modified rc.S and rc.6 as workaround.
I don't know if it can be helpful to broader audience.
Anyways, here comes the code (bold is mine, the same code for both rc.S and rc.6):
Code:
# hwclock will often hang for a few seconds when reading or writing
# the RTC while wakealarm <> 0. Clear wakealarm temporarily.
if [ -w /sys/class/rtc/rtc0/wakealarm ]; then
WAKEALARM=$(cat /sys/class/rtc/rtc0/wakealarm)
if [ -n "$WAKEALARM" ]; then
echo "Clearing wakealarm: echo 0 > /sys/class/rtc/rtc0/wakealarm"
echo 0 > /sys/class/rtc/rtc0/wakealarm
fi
fi
[..]
if [ -x /sbin/hwclock ]; then
[..]
fi
# Restore wakealarm.
if [ -w /sys/class/rtc/rtc0/wakealarm ]; then
if [ -n "$WAKEALARM" ]; then
echo "Restoring wakealarm: echo $WAKEALARM > /sys/class/rtc/rtc0/wakealarm"
echo $WAKEALARM > /sys/class/rtc/rtc0/wakealarm
fi
unset WAKEALARM
fi
--
Best regards,
Andrzej Telszewski
This is a known RTC driver timer queue issue.
There is a patch, but I do not know when Alexandre will submit it to Linus.
Already posted,but this version contain many CVE fix , bug fix and enhancement, i think this version is better also for the recent cups-filters version
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