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From: Cyril Hrubis <chrubis@suse.cz>
To: Li Wang <liwang@redhat.com>
Cc: ltp@lists.linux.it
Subject: Re: [LTP] [PATCH v2] sched_football: synchronize with kickoff flag to reduce skew
Date: Fri, 5 Sep 2025 15:45:03 +0200	[thread overview]
Message-ID: <aLrpX5Cd0ljf66Yo@yuki.lan> (raw)
In-Reply-To: <CAEemH2c_26s1ojGnStAxzGHVEhbVTpM0dL3PU=Od=G90gPvnGg@mail.gmail.com>

Hi!
> Thanks, I do manually test and now almost 1/20 times fail.
> And the worth mentioning that this is not a new failure in RHEL kernels.
> Those patches since the barrier have already much improved the test
> result from RHEL side. At least from RHEL RT-kernel I didn't observe
> fail any more.
> 
> So ,as long as the patch works on the SUSE kernel to resolve it's NEW
> problem,
> I think we can merge.

I got another idea meanwhile, what happens if we keep bussy loop for the
defense and add the sched_yield() only to offense and crazy fans? That
should ensure that before the kickoff the defense threads should be
hogging the available CPUs.

-- 
Cyril Hrubis
chrubis@suse.cz

-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

  reply	other threads:[~2025-09-05 13:44 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-04 10:26 [LTP] [PATCH v2] sched_football: synchronize with kickoff flag to reduce skew Li Wang via ltp
2025-09-04 11:00 ` Petr Vorel
2025-09-04 11:42   ` Cyril Hrubis
2025-09-04 13:14     ` Li Wang via ltp
2025-09-04 15:28       ` Cyril Hrubis
2025-09-05  0:54         ` Li Wang via ltp
2025-09-05  4:03           ` Li Wang via ltp
2025-09-05  6:50             ` Li Wang via ltp
2025-09-05  7:03             ` Petr Vorel
2025-09-05  7:31               ` Petr Vorel
2025-09-05  7:36                 ` Li Wang via ltp
2025-09-05  9:18             ` Cyril Hrubis
2025-09-05 11:50               ` Li Wang via ltp
2025-09-05 12:32                 ` Cyril Hrubis
2025-09-05 12:46                   ` Petr Vorel
2025-09-06  0:58                     ` Li Wang via ltp
2025-09-05 12:49                   ` Li Wang via ltp
2025-09-05 13:45                     ` Cyril Hrubis [this message]
2025-09-05 14:48                       ` Li Wang via ltp
2025-09-04 18:26       ` Petr Vorel

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