27 Nov
2010
27 Nov
'10
11:29 p.m.
On 11/27/2010 01:15 PM, Leigh Dyer wrote:
On Sat, 2010-11-27 at 11:24 +0100, rosea.grammostola
wrote:
Hmm when I read about the conservative mode, I wouldn't expect it to be
useful for audio work (playing pianoteq in this case), but I must say,
no xruns...
And it looks like my thinkfan configuration does more harm then good atm...
I will explore a bit more.
Thanks!
\r
Hi,
When I set cpu scaling with sudo cpufreq-set -g performance, I have the
best proaudio performance on my thinkpad T61. But, that will also heat
things up very quickly with as consequence more sound from the fans.
The laptop is more silent when I use, sudo cpufreq-set -g ondemand, but
I get more xruns then.
Is it possible to adjust the ondemand settings to find more balance
between performance and noise? How?
You'll almost certainly be getting xruns not because the CPU is running
slower sometimes in "ondemand" mode, but because the CPU is changing
between fast and slow speeds. This speed change causes the CPU to pause
momentarily, and can very easily cause xruns; I've found that this is a
really common cause of JACK xrun issues with laptops.
The good thing is that, unless you're doing something quite CPU
intensive, you might be able to run your CPU at its lowest speed -- as
long as it's not changing speeds, you still shouldn't see xruns. Setting
the CPU governor to "conservative" will lock you in at your CPU's lowest
speed.
If that's not enough, you might be able to set your CPU to a specific
speed that's still lower than its maximum -- I know my 2.4Ghz laptop has
both 800Mhz and 1.6Ghz settings, for instance.