[LAU] Which kernel do you use?

[Ralf Mardorf]

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 at 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.