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.
http://www.spinics.net/lists/linux-rt-users/msg12170.html
HTH, -Harry
On Fri, Jan 23, 2015 at 5:32 PM, Hermann Meyer <brummer-(a)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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