Red Hat Bugzilla – Bug 246813
cpu running f7 is a lot hotter unless nohz=off is used
Last modified: 2007-11-30 17:12:09 EST
Description of problem:
My Duron 1000 machine is running a lot hotter since I installed f7. It used to
have a 54-58C CPU temperature, now it is 58-62C. I noticed that this is reduced
to nearly the previous value if I use nohz=off
Version-Release number of selected component (if applicable):
Normal computer use
Is cpufreq reducing the CPU speed when nohz is enabled?
Load the cpufreq_stats module ('modprobe cpufreq_stats'),
then look in:
Compare with and without nohz.
I don't think that my Duron supports cpufreq. Here is the /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 7
model name : AMD Duron(tm)
stepping : 0
cpu MHz : 999.050
cache size : 64 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat
pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up ts
bogomips : 1999.76
clflush size : 32
Can you please provide a full boot log and the output of /proc/timer_list, when
booted with nohz enabled ?
I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the fedora kernel.
I am CC'ing myself to this bug and will try and assist you in resolving it if I can.
There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel?
If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.
I am closing this bug now. I don't have the time to debug it at the moment as it
takes a long time to notice changes. I am also not sure if the problem still exists.