Re: SCHED_DEADLINE tasks missing their deadline with SCHED_FLAG_RECLAIM jobs in the mix (using GRUB)

Marcel Ziswiler
2025-06-25T16:13:06Z

Hi Juri

On Tue, 2025-06-24 at 14:59 +0200, Juri Lelli wrote:
> Hello again,
>
> On 24/06/25 09:49, Juri Lelli wrote:
>
> ...
>
> > The following seem to at least cure the problem after boot. Things are
> > still broken after cpusets creation. Moving to look into that, but
> > wanted to share where I am so that we don't duplicate work.
>
> I ended up with two additional patches that seem to make things a little
> better at my end. You can find them at
>
> https://github.com/jlelli/linux/tree/upstream/fix-grub
>
> Marcel, Luca, can you please give them a quick try to check if they do
> any good?

I gave this a try yesterday and run a first longer test in our CI. While that now only run for 16 hours doing
30+ mio. tests on NUCs and 75+ mio. on ROCK 5B it really looks promising so far.

I will now update to your latest patches and re-run those tests. Usually we need 40+ hours of testing to really
be confident in our statistics around those tests.

> Thanks!

Thank you!

> Juri

Cheers from the OSS NA/ELC in Denver

Marcel