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From: Juri Lelli <juri.lelli@redhat.com>
To: David Haufe <dhaufe@simplextrading.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Kernel 6.14.11 dl_server_timer(...) causing IPI/Function Call Interrupts on isolcpu/nohz_full cores, performance regression
Date: Wed, 3 Dec 2025 15:29:16 +0100	[thread overview]
Message-ID: <aTBJPCiI9iVNYTWR@jlelli-thinkpadt14gen4.remote.csb> (raw)
In-Reply-To: <CAKJHwtMAHpOpm4QJLFKES9Uz_9XPa9gX_QvLYCzvWEjMEjv6YA@mail.gmail.com>

On 25/11/25 13:33, David Haufe wrote:
> f237e524f3c7 ("sched/deadline: Make dl-server nohz full aware") <--
> patch applied
> 219a63335b67 ("sched/deadline: Don't count nr_running twice for
> dl_server proxy tasks") <-- exists in mainline 6.17
> 7620177e8108 ("sched/deadline: Fix RT task potential starvation when
> expiry time passed") <-- exists in mainline 6.17
> cccb45d7c429 ("sched/deadline: Less agressive dl_server handling") <--
> slightly different code but exists in mainline 6.17
> 
> The "nohz full aware" patch does stop the hrtimer interrupts. I will
> watch for that merge and can patch locally for now. Thank you!

Thanks for testing and reporting!

Unfortunately (as I mentioned) I will be soon traveling + pto until
essentially next year. So, apologies, but I will most probably need to
defer cleaning up and send out a proper version to beginning of 2026.
Hope that's OK.

Best,
Juri


  reply	other threads:[~2025-12-03 14:29 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-30 16:51 Kernel 6.14.11 dl_server_timer(...) causing IPI/Function Call Interrupts on isolcpu/nohz_full cores, performance regression David Haufe
2025-07-31  7:01 ` Juri Lelli
2025-07-31 17:50   ` David Haufe
     [not found]   ` <CAKJHwtOZkrR9kEj+tffq=o0i1fPi3P+8BTHz3RyPDmn=uDOF7g@mail.gmail.com>
2025-08-01  9:06     ` Juri Lelli
2025-08-01 15:28       ` David Haufe
2025-08-04 14:49         ` Juri Lelli
2025-08-04 15:44           ` David Haufe
2025-08-04 16:58             ` Juri Lelli
2025-11-24 20:30               ` David Haufe
2025-11-25 13:58                 ` Juri Lelli
2025-11-25 19:33                   ` David Haufe
2025-12-03 14:29                     ` Juri Lelli [this message]
2026-04-10 16:39                     ` Cao Ruichuang
2026-04-24 12:38                       ` Juri Lelli

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