[LAU] limits.conf nice rtprio

[Jaromír Mikeš]

2017-08-17 17:17 GMT+02:00 Ralf Mardorf <ralf.mardorf at alice-dsl.net>:

> Hi,
>
> I guess the nice values are null and void, IOW IIUC they don't affect
> anything [1], at least for cosmetical reasons remove it from your
> limits.conf. If you fear that something could become unresponsive, you
> could decrease "rtprio 99" to a lower value. I never did it myself, but
> some users do so.
>
> To optimize real-time performance you should start with using Rui's
> script rtirq [2]. There are other things to improve real-time
> capability, often setting the cpu frequency scaling governor to
> performance improves a lot [3]. There are additional useful
> opportunities, e.g. unbinding USB devices that share an IRQ with the
> audio device could be helpful, but a lot of hints provided by the
> Internet are plain nonsense. The most important thing to consider is
> choosing the appropriate kernel. For some tasks it's useful to build a
> rt patched kernel [4]. The so called "lowlatency" kernels provided by
> Ubuntu flavours gains you more or less nothing. If you should use a
> mainline kernel, simply add "threadirqs" to the boot parameters, for
> syslinux it does look like e.g. this
>

Thanks Paul and Ralf for wiping old this old myth I was living in ;)

What about my 2nd question?
In qjackctrl Settings -> Advanced ... there is a "Priority" option ...
It corresponds to -P cli option
For what is it good and how it should be used?

mira
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