[Ardour-Users] Denormals

Benjamin Scherrer realhangman at web.de
Sat Dec 31 09:42:24 PST 2011


interestingly, jack2 on my debian 64bit system simply refuses to let the
ondemand governor change the frequency, so it stays at whatever
frequency it was. I set

cpufreq-set -g performance -cX

before starting jack and

cpufreq-set -g ondemand -cX

after I kill jack for best performance while preserving power saving
when not working on audio. Never had any issues.


Am 31.12.2011 18:08, schrieb Q:
> On 31/12/11 16:04, Paul Davis wrote:
>> On Sat, Dec 31, 2011 at 10:59 AM, Al
>> Thompson<althompson58 at gmail.com>  wrote:
>>> On 12/31/2011 09:50 AM, Paul Davis wrote:
>>>> are you using active frequency scaling (ie. power management)? this is
>>>> not compatible with low latency realtime audio, JACK or otherwise.
>>>> whatever tools your distro provides to manage this, you should disable
>>>> it or set it to "performance" or something similarly worded.
>>> This has been an issue with me, too.  I recently got a new dual core
>>> laptop, and am running Fedora 14, and nothing I've come across yet has
>>> disabled CPU throttling.  It still insists that speed scaling is
>>> controlled by the "ondemand" governor, and I can't even change CPU
>>> speeds with the cpu-speed tools.
>> i've never found any tools on F13 either, so i disabled it all in the
>> BIOS. its one of the very few complaints i have about fedora, but i
>> never notice it because of the aforementioned disabling.
> I ran into frequency scaling issues many years ago and ever since my
> machine has been running permanently at full speed -- I think I
> fiddled with one of the config files to do that. The little panel
> applet says it's running on demand but I think it only has the option
> of full speed or full speed :-)
> Q
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