[LAU] Which kernel do you use?

Harry van Haaren harryhaaren at gmail.com
Fri Jan 23 17:36:05 UTC 2015

CPU scaling is broken in "recent" -rt; particularly on older CPU's
(without the intel pstate stuff). I've also built -rt with the
performance governer on as default, and some code in the kernel
dis-allows any changing of CPU frequency.

There's a thread over on -rt users, but it wasn't resolved yet: hence
building with performance. Apart from minor lower battery life, and
some extra heat / fan-noise, there's no dis-advantage.

HTH, -Harry

On Fri, Jan 23, 2015 at 5:32 PM, Hermann Meyer <brummer- at web.de> wrote:
> Am 23.01.2015 um 18:15 schrieb Ralf Mardorf:
>> On Fri, 23 Jan 2015 12:45:39 +0100, Raffaele Morelli wrote:
>>> I recently compiled longterm 3.14.29 with realtime patch
>>> https://www.kernel.org/pub/linux/kernel/projects/rt/3.14/
>>> works like a charm
>> Assumed you don't need CPU frequency scaling "performance", can you
>> switch to ondemand?
>> _______________________________________________
> According to Raffaeles .config file,  CPU frequency scaling is completely
> disabled.
> One of the difference to mine config, were I've set frequency scaling to
> performance on default.
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