Re: [ANNOUNCE] v5.10-rc2-rt4

[Sebastian Andrzej Siewior]

On 2020-11-12 13:39:02 [+0100], Daniel Wagner wrote:
> With the current version signaltest + your test patch and 'taskset -c1'
> the results looks good again, around 230us (running since 2 hours). I've
> tested first without taskset and it took about an half hour to hit
> 350us. So pinning the threads on one CPU fixes it.

okay. So case closed.

> I think we change signaltest to use the correct affinity on
> default. Also, I see that sigwaittest has some code for it, but it, but
> it would be a good idea to set the defaults so that out of the box the
> test does the right thing.

Sounds reasonable. Having tasks jumping from one CPU to another may lead
to higher latencies.

> I'm sorry about dragging you into this problem.
I feared that something in lazy preempt or signal stack is broken. But
it appears not to be the case :)

Sebastian