A work-around mentioned by others in possibly related nvidia bug reports
(bug 656279) is to disable hyperthreading processors before suspending
and re-enable them after resume. That actually works for this problem as
well. The slow performance after resume is gone.
I put the following script into /etc/pm/sleep.d/10_ht.sh :
#!/bin/sh
# Disable hyper-threading processor cores on suspend and hibernate, re-enable
them
# on resume. Presumably helps for buggy nvidia or kernel behaviour.
# This file goes into /etc/pm/sleep.d/
case $1 in
hibernate|suspend)
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 0 > /sys/devices/system/cpu/cpu3/online
;;
thaw|resume)
echo 1 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu3/online
;;
esac
Of course, the script needs to be adapted according to CPU type of the target
system, or improved to just autodetect all hyper-threading processors. I have a
Core i7 with two real cores(proc id 0 and 2) and two hyper-threading cores
(proc id 1 and 3).
--
Performance drop after suspend/resume cycle
https://bugs.launchpad.net/bugs/671932
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