Re: [LAU] rtirq configuration with external USB DAC?

On Tue, August 13, 2019 10:11 am, al3xu5 / dotcommon wrote: The RT prioritization should be based on what devices and software should always be serviced in a timely manner. In the context of this audio group that would mean the audio device driver(s), jackd if that is used, and then anything else which might be critical. The jackd server will set priority independently, so the only entries which need to be in rtirq are the hardware device drivers which need realtime priority. There is no current software that I am aware of which could require realtime access to the hardware realtime clock (despite the name it is not related to realtime behavior in this context). Including that device in the rtirq list just wastes processor time servicing a device with no use for audio. The i8042 is the emulated legacy keyboard controller. I do not think it is necessary, but I could accept the argument that you don't want to miss any user interaction. It should definitely be last in the list, so the i8042 is at the lowest realtime priority. Probably as a practical concern there is no reason to keep i8042 in the list, user interaction is slow enough that unless the RT software is not behaving correctly the key input should still be serviced, and if the RT software is behaving in a way which uses too much processor time it will probably not respond properly to user key presses, so in either case having the keyboard controller driver serviced with realtime priority does not seem to offer benefit. -- Chris Caudle