https://bugzilla.novell.com/show_bug.cgi?id=299891#c59
Thomas Renninger changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|len.brown@intel.com |
Status|ASSIGNED |NEEDINFO
Info Provider| |j.reitsma@hccnet.nl
--- Comment #59 from Thomas Renninger 2007-09-25 11:31:58 MST ---
Coming in between Alpha7 and Beta1 are only using ondemand per default governor
and nohz patches.
First we should check whether it's ondemand governor breaking things. (Maybe
ondemand governor already tries to set another freq on cpu0 while cpu1 is still
initialising and this Opteron does not like that?)
Could it be that Alpha7 was an updated system (still having userspace governor
set per default)
Do you have:
CPUFREQ_ENABLED="userspace"
set in /etc/sysconfig/powersave/cpufreq ?
Ohh... with ondemand per default the userspace workaround does not work anymore
for machines freezing with ondemand governor. It depends on the switching
latency of the driver, but if the driver (powernow-k8) is supposed to work with
ondemand, the governor is used automatically at driver load time now.
I placed a kernel with cpufreq debug and with performance governor used per
default here:
ftp.suse.com/pub/people/trenn/performance_gov_default_10_3/kernel-default-2.6.22.8-31.x86_64.rpm
modprobe powernow-k8 should work now?
and
modprobe cpufreq_ondemand
echo ondemand >/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo ondemand >/sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
echo ondemand >/sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
echo ondemand >/sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
freezes the system?
If not it could be that ondemand governor already kicks in for cpu0 while cpu1
still gets initialised...
If yes:
We could only blacklist the CPU revision of these Opterons to not use ondemand
per default.
Because cpufreq (with ondemand per default) is used at installation time now
where no userspace tools are available, fiddling around in userspace is not a
real option here...
Because of ICQ: I mailed you my data privately, I can also have a look at an
irc channel tomorrow if you prefer this one...
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