[atari800]

I have Apple TV1 setup with Ubunto 11.10 and XBMC Dharma stable
Everything is running great except for my network connection is slow/choppy
I know it is because my max_cstate is not set to 2

In 8.04 I could edit /etc/modprobe.d/options and add
options processor max_cstate=2


However in 11.10, I cannot find out where to set this.


Also - how to set cpu to PERFORMANCE mode after a reboot
I set it this way:
sudo bash -c "echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"

But a reboot reverts it back to some power-saving mode


Any help here is appreciated

[atari800]

Update:
It appears that network speed is a problem in 11.10

[Sam.Nazarko]

Hi,

Governor reverts because you aren't setting it permanently. Remember the norm is to configure in sysctl.conf, or in this case, the cpufreq governor settings. I set using /etc/default/cpufrequtils (see July update).

Verify max cstate is being set, else specify it as a kernel flag.

[atari800]

Hi Sam
Thanks for the hints

*note: This is Oneiric 11.10 - straight build, not a live usb or Crystalbuntu

/etc/default/cpufrequtils - does not exist
-I installed cpufrequtils and can control it but a reboot reverts back to 600mhz
-still /etc/default/cpufrequtils does not exist

sysctl.conf - I am looking for syntax for cpu governor, but no luck just yet



Max_cstate Current:
Kernel command line: root=/dev/sda4 ro vesa video=vesafb intel_idle.max_cstate=1

Previous:
Kernel command line: root=/dev/sda4 ro vesa video=vesafb processor.max_cstate=1

However in 8.04 ubuntu I'd see:
Kernel command line: root=/dev/sda4 ro vesa video=vesafb processor.max_cstate=1
*Unknown boot option `processor.max_cstate=1': ignoring
*ACPI: processor limited to max C-state 1

*info from dmesg

How can I verify what cstate is being used?
thanks for the assist

[Sam.Nazarko]

Hi,

I understand it is Oneiric. Lucid is probably a better target as it is LTS.

Put the CPU clocking in rc.local then or @reboot in cron.

cat /proc/acpi/processor/CPU0/power |grep max_cstate

Will inform you of cstate

[atari800]

thank you

8.04 shows:
cat /proc/acpi/processor/CPU0/power
active state: C0
max_cstate: C1
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
C1: type[C1] promotion[--] demotion[--] latency[001] usage[34331243] duration[00000000000000000000]
C2: type[C2] promotion[--] demotion[--] latency[001] usage[00000000] duration[00000000000000000000]
C3: type[C3] promotion[--] demotion[--] latency[057] usage[00000000] duration[00000000000000000000]

11.10 shows
cat: /proc/acpi/processor/CPU0/power: No such file or directory

I'll take care of the "clocking on reboot" later (using your suggestion).


network speed is slow (about 300k per second)
I am wget'ing files off the internet to get speed result.

[Sam.Nazarko]

my advice is to stay with LTS, why are you trying to install Oneiric anyway?

[atari800]

something to do.
Watching XBMC on Apple TV is great but I like rebuilding it.

and I figured out the speed problem
Kernel command line: root=/dev/sda4 ro vesa video=vesafb intel_idle.max_cstate=1 nohpet

now wget works F-A-S-T
72% [===========================> ] 23,576,928 2.83M/s eta 4s


No HDMI sound - using TOSLINK but thats ok

[Sam.Nazarko]

You will get HDMI sound back if you compile 2.6.24 series and install 100.14.19/23 drivers. Good catch on hpet!

[atari800]

My other 3 apple tv 1's are 8.04 with HDMI sound