From: Stephen Hemminger <stephen@networkplumber.org>
To: Tyler Retzlaff <roretzla@linux.microsoft.com>
Cc: dev@dpdk.org, thomas@monjalon.net, dmitry.kozliuk@gmail.com,
anatoly.burakov@intel.com,
Narcisa Vasile <navasile@linux.microsoft.com>
Subject: Re: [PATCH v3 1/2] eal: get/set thread priority per thread identifier
Date: Tue, 24 May 2022 07:51:05 -0700 [thread overview]
Message-ID: <20220524075105.01713e7d@hermes.local> (raw)
In-Reply-To: <1653390517-4033-2-git-send-email-roretzla@linux.microsoft.com>
On Tue, 24 May 2022 04:08:36 -0700
Tyler Retzlaff <roretzla@linux.microsoft.com> wrote:
> +static int
> +thread_map_priority_to_os_value(enum rte_thread_priority eal_pri,
> + int *os_pri, int *pol)
> +{
> + /* Clear the output parameters */
> + *os_pri = sched_get_priority_min(SCHED_OTHER) - 1;
> + *pol = -1;
> +
> + switch (eal_pri) {
> + case RTE_THREAD_PRIORITY_NORMAL:
> + *pol = SCHED_OTHER;
> +
> + /*
> + * Choose the middle of the range to represent
> + * the priority 'normal'.
> + * On Linux, this should be 0, since both
> + * sched_get_priority_min/_max return 0 for SCHED_OTHER.
> + */
> + *os_pri = (sched_get_priority_min(SCHED_OTHER) +
> + sched_get_priority_max(SCHED_OTHER))/2;
> + break;
> + case RTE_THREAD_PRIORITY_REALTIME_CRITICAL:
> + *pol = SCHED_RR;
> + *os_pri = sched_get_priority_max(SCHED_RR);
> + break;
Many people have experimented with realtime priorities with DPDK
and Linux, and have never heard of any one not having problems.
Recommend that this either be an error add a warning log message
that "Setting real time priority may break"
> + default:
> + RTE_LOG(DEBUG, EAL, "The requested priority value is invalid.\n");
> + return EINVAL;
> + }
> + return 0;
> +}
next prev parent reply other threads:[~2022-05-24 14:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-23 10:46 [PATCH 0/2] add thread priority accessors Tyler Retzlaff
2022-05-23 10:46 ` [PATCH 1/2] eal: get/set thread priority per thread identifier Tyler Retzlaff
2022-05-23 10:46 ` [PATCH 2/2] test/threads: add unit test for get set priority Tyler Retzlaff
2022-05-23 10:52 ` Tyler Retzlaff
2022-05-23 13:07 ` [PATCH v2 0/2] add thread priority accessors Tyler Retzlaff
2022-05-23 13:07 ` [PATCH v2 1/2] eal: get/set thread priority per thread identifier Tyler Retzlaff
2022-05-23 13:07 ` [PATCH v2 2/2] test/threads: add unit test for get set priority Tyler Retzlaff
2022-05-24 11:08 ` [PATCH v3 0/2] add thread priority accessors Tyler Retzlaff
2022-05-24 11:08 ` [PATCH v3 1/2] eal: get/set thread priority per thread identifier Tyler Retzlaff
2022-05-24 14:51 ` Stephen Hemminger [this message]
2022-05-26 6:29 ` Tyler Retzlaff
2022-05-26 15:21 ` Stephen Hemminger
2022-05-27 11:15 ` Tyler Retzlaff
2022-05-24 11:08 ` [PATCH v3 2/2] test/threads: add unit test for get set priority Tyler Retzlaff
2022-06-07 10:39 ` [PATCH v3 0/2] add thread priority accessors David Marchand
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