Re: [LAU] rtirq questions

On 09.03.20 00:19, Chris Caudle wrote:
> On Sun, March 8, 2020 6:53 am, Roger wrote:
>> On 8/3/20 8:55 pm, Max wrote:
>>> Is there a way to verify if the kernel was loaded with the threadirqs
>>> option, so this test could be added to realtimeconfigquickscan?
>>
>> Interesting question and it came up using a quick search of you question
>> in the first few results, in the Mixxx wiki -
>> https://www.mixxx.org/wiki/doku.php/adjusting_audio_latency
>>
>> grep threadirqs /proc/cmdline
>
> With the caveat that you will also need to check whether the kernel is
> running the full RT patch, in which case IRQ handling is always threaded,
> so the threadirqs command line option is not needed. Also note that even
> with the threadirqs command line, I do not think threaded IRQ handling is
> implemented if the PREEMPT option is not selected when the kernel is
> compiled. That was the case in the past, I have not verified it is still
> the case with the very latest, although if you are looking for low latency
> you will probably want to verify that the kernel is configured with at
> least PREEMPT if not using the full PREEMPT-RT patches.
>

I had the feeling this is quite complex to put into a script that checks
for all these cases and gives a recommendation.

https://github.com/raboof/realtimeconfigquickscan/issues/31

If you know how to query for those different options please share.
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Received on Tue Mar 10 04:15:02 2020