https://bugzilla.kernel.org/show_bug.cgi?id=187311
DE <risc4...@yahoo.com> changed:
What |Removed |Added
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CC| |risc4...@yahoo.com
--- Comment #21 from DE <risc4...@yahoo.com> ---
Hello guys, it appears that it is not a good idea to use laptops...
I also get ridiculous amount of time to reach the boot screen of Ubuntu on my
AMD CQ57 laptop.
I have had huge performance issues on that laptop as well as crashes. In order
to fix those, I had to check all CPU errata and decode some MSR values. My BIOS
has not patched a specific erratum and I made a simple patch. This resulted in
a rather large communication which is still in
progress[http://marc.info/?t=147688796200001&r=1&w=2].
While trying to see what is wrong, I found that my CPU was in C2 mode most of
the time whether it run on AC or battery! To get better performance I have to
use processor.max_cstate=1 as well as apply my erratum patch. Unfortunately
when I limit my laptop to C1, C1 option is vanished and no C state is left!
What is worse, crashes were observed on intel machines too
[https://bugzilla.kernel.org/show_bug.cgi?id=109051]
Pavel can you run some commands and inform me here?
replace * with the CPU number
first get
cat /sys/bus/cpu/devices/cpu*/cpufreq/scaling_available_governors
then
cat /sys/bus/cpu/devices/cpu*/cpufreq/scaling_governor
now get
ls /sys/devices/system/cpu/cpu*/cpuidle
if the above is not empty then for each state of each CPU run(replace % with
state number from the above command)
cat /sys/devices/system/cpu/cpu*/cpuidle/state%/name
cat /sys/devices/system/cpu/cpu*/cpuidle/state%/usage
all those numbers will tell us how much time your CPUs spend on each C state.
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