From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Thomas Monjalon" <thomas@monjalon.net>, <dev@dpdk.org>
Cc: "David Marchand" <david.marchand@redhat.com>, <stable@dpdk.org>,
"Anatoly Burakov" <anatoly.burakov@intel.com>,
"Stephen Hemminger" <stephen@networkplumber.org>,
"Narcisa Vasile" <navasile@linux.microsoft.com>,
"Tyler Retzlaff" <roretzla@linux.microsoft.com>,
"Dmitry Kozlyuk" <dmitry.kozliuk@gmail.com>,
"Konstantin Ananyev" <konstantin.v.ananyev@yandex.ru>,
"Andrew Rybchenko" <andrew.rybchenko@oktetlabs.ru>
Subject: RE: [PATCH] eal/unix: allow creating thread with real-time priority
Date: Tue, 24 Oct 2023 15:55:13 +0200 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35E9EF75@smartserver.smartshare.dk> (raw)
In-Reply-To: <20231024125416.798897-1-thomas@monjalon.net>
> From: Thomas Monjalon [mailto:thomas@monjalon.net]
> Sent: Tuesday, 24 October 2023 14.54
>
> When adding an API for creating threads,
> the real-time priority has been forbidden on Unix.
>
> There is a known issue with ring behaviour,
> but it should not be completely forbidden.
>
> Fixes: ca04c78b6262 ("eal: get/set thread priority per thread identifier")
> Fixes: ce6e911d20f6 ("eal: add thread lifetime API")
> Fixes: a7ba40b2b1bf ("drivers: convert to internal control threads")
> Cc: stable@dpdk.org
>
> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> ---
[...]
> @@ -815,7 +815,9 @@ Known Issues
>
> 4. It MAY be used by preemptible multi-producer and/or preemptible multi-
> consumer pthreads whose scheduling policy are all SCHED_OTHER(cfs), SCHED_IDLE
> or SCHED_BATCH. User SHOULD be aware of the performance penalty before using
> it.
>
> - 5. It MUST not be used by multi-producer/consumer pthreads, whose
> scheduling policies are SCHED_FIFO or SCHED_RR.
> + 5. It MUST not be used by multi-producer/consumer pthreads
> + whose scheduling policies are ``SCHED_FIFO``
> + or ``SCHED_RR`` (``RTE_THREAD_PRIORITY_REALTIME_CRITICAL``).
Do the RTS or HTS ring modes make any difference here?
Anyway, I agree that real-time priority should not be forbidden on Unix.
Acked-by: Morten Brørup <mb@smartsharesystems.com>
next prev parent reply other threads:[~2023-10-24 13:55 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-24 12:54 Thomas Monjalon
2023-10-24 13:55 ` Morten Brørup [this message]
2023-10-24 16:04 ` Stephen Hemminger
2023-10-25 13:15 ` Thomas Monjalon
2023-10-25 13:34 ` Bruce Richardson
2023-10-25 13:44 ` Thomas Monjalon
2023-10-25 15:08 ` Stephen Hemminger
2023-10-25 15:14 ` Bruce Richardson
2023-10-25 15:18 ` Thomas Monjalon
2023-10-25 15:32 ` Thomas Monjalon
2023-10-25 15:13 ` [PATCH v2] " Thomas Monjalon
2023-10-25 15:37 ` Stephen Hemminger
2023-10-25 16:46 ` Thomas Monjalon
2023-10-25 17:54 ` Morten Brørup
2023-10-25 21:33 ` Stephen Hemminger
2023-10-26 7:33 ` Morten Brørup
2023-10-26 16:32 ` Stephen Hemminger
2023-10-26 17:07 ` Morten Brørup
2023-10-26 0:00 ` Stephen Hemminger
[not found] ` <20231025163352.1076755-1-thomas@monjalon.net>
2023-10-25 16:31 ` [PATCH v3 2/2] " Thomas Monjalon
[not found] ` <20231026134313.1165954-1-thomas@monjalon.net>
2023-10-26 13:37 ` [PATCH v4 " Thomas Monjalon
[not found] ` <20231026142749.1174372-1-thomas@monjalon.net>
2023-10-26 14:19 ` [PATCH v5 " Thomas Monjalon
2023-10-27 8:08 ` [PATCH v6 1/1] " Thomas Monjalon
2023-10-27 8:45 ` Morten Brørup
2023-10-27 9:11 ` Thomas Monjalon
2023-10-27 18:15 ` Stephen Hemminger
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