23 Jan
2015
23 Jan
'15
7:12 p.m.
On Fri, 23 Jan 2015 18:32:07 +0100, Hermann Meyer wrote:
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.
On Fri, 23 Jan 2015 17:36:05 +0000, Harry van Haaren wrote:
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
I just wanted to point out, that the CPU frequency scaling governor
might be useful for some computer usage. For audio production
"performance" is all we need.
3.14-rts suffer from this issue.
3.10-rts seems to be ok.
While Herman gets best results with 3.4 series, I still had good luck
with 3.8.13-rt14. I don't want to mount all my old installs I still
kept, but IIRC ...
[rocketmouse@archlinux ~]$ ls -hAl /mnt/debi386/boot/vm*3.8*
-rw-r--r-- 1 root root 2.8M Mar 21
2014 /mnt/debi386/boot/vmlinuz-3.8.13.14-rt30-pae-rocketmouse-1
-rw-r--r-- 1 root root 2.8M Jan 27
2014 /mnt/debi386/boot/vmlinuz-3.8.13-rt14-pae-rocketmouse-2
... there were other builds ok too for 3.8 series, at least
3.8.13.14-rt30 ;). But as mentioned before, I'm not using an aged Intel
machine. I'm using an aged AMD machine. Don't worry about the PAE, I
used them with 32-bit and 64-bit architecture.
I don't remember if I used the aged onboard ATI, as I do now, or my
aged PCIe NVIDIA. Usually both aged graphics work ok with the FLOSS
drivers, when using Xfce4, Mate, JWM and openbox or similar, IIRC e.g.
Razor-Qt. They fail when using Cinnamon. I didn't really use Mate, but
Xfce4 a lot and nowadays I prefer JWM and openbox.