Re: [LAU] Which kernel do you use?

From: Will Godfrey <willgodfrey@email-addr-hidden>
Date: Fri Jan 23 2015 - 20:46:24 EET

On Fri, 23 Jan 2015 19:12:32 +0100
Ralf Mardorf <ralf.mardorf@email-addr-hidden-dsl.net> wrote:

> 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@email-addr-hidden ~]$ 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.
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This is all very depressing!

I may need to get a laptop in the near future (for the first time) specifically
for audio, and I fear the possibility of a rather expensive mistake... or two :(

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.
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Received on Sat Jan 24 00:15:04 2015

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