Power kernel poor pulseaudio/sip performance

[rajil.s]

Hi,

I installed Power Kernel from extras and havent enabled any overclocking. The cpu usage in a sip call is about 60% compared to 40% in the stock kernel. The pulseaudio cpu usage is particularly high.

Is there any workaround for this?

[tliljend]

Usage is not full truth you should also follow on what speed(s) CPU was running while looking CPU load. Different speed of CPU and different CPU load threshold can explain why load was different (but still same amount CPU cycles was used).

[rajil.s]

Ok, here the details during a sip call:

Stock kernel

#cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
500000

#top
Mem: 231816K used, 13724K free, 0K shrd, 4452K buff, 82476K cached
CPU: 34.8% usr 15.1% sys  0.0% nice 49.0% idle  0.0% io  0.0% irq  0.9% softirq
Load average: 3.42 2.53 1.23
  PID  PPID USER     STAT   RSS %MEM %CPU COMMAND
  786     1 pulse    S <   3852  1.5 30.0 /usr/bin/pulseaudio --system --high-priority 
 2682     1 user     S <  13036  5.2 16.6 /usr/lib/telepathy/telepathy-stream-engine

Power kernel

#cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
600000
#top
Mem: 226924K used, 18344K free, 0K shrd, 13180K buff, 85928K cached
CPU: 61.2% usr 24.7% sys  0.0% nice 12.1% idle  0.0% io  0.0% irq  1.8% softirq
Load average: 3.14 1.85 0.74
  PID  PPID USER     STAT   RSS %MEM %CPU COMMAND
  773     1 pulse    R <   4928  2.0 48.0 /usr/bin/pulseaudio --system --high-priority 
 1558     1 user     S <  13108  5.3 29.5 /usr/lib/telepathy/telepathy-stream-engine

It seems Power Kernel locks the device at a higher cpu frequency compared to stock. What makes is it worse that pulseaudio eats more cpu at this high frequency

[RobbieThe1st]

More than likely, your measurements are errored. It probably dropped to 250(or something) for a short time between measuring the cpu freq and the output from top.

Try with conky instead, so you can get simultanious numbers - Though, the accuracy may still be bad.

Really, though, does it matter? Provided the usable performance is approximately the same, ignore it.

[rajil.s]

You might be right about frequency dropping to 250. Unfortunately, the call quality is poor in power kernel compared to stock. It gets a bit jittery due to high cpu usage. I have filed a bug.

[rwnoob]

Anybody having camera issues after installing latest version of linux power kernal from extras?

[James_Littler]

Originally Posted by rwnoob

Anybody having camera issues after installing latest version of linux power kernal from extras?

Nope, have you got fcam installed? Have you updated the fcam drivers with titans latest ones?