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Tue, 9 Nov 2021 03:27:10 -0500 (EST) From: Thomas Monjalon <thomas@monjalon.net> To: Narcisa Ana Maria Vasile <navasile@linux.microsoft.com> Cc: dev@dpdk.org, dmitry.kozliuk@gmail.com, khot@microsoft.com, dmitrym@microsoft.com, roretzla@microsoft.com, talshn@nvidia.com, ocardona@microsoft.com, bruce.richardson@intel.com, david.marchand@redhat.com, pallavi.kadam@intel.com, stephen@networkplumber.org Date: Tue, 09 Nov 2021 09:27:09 +0100 Message-ID: <6965604.4qUlQkvJ3b@thomas> In-Reply-To: <20211109015923.GB12569@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> References: <1633732841-17873-1-git-send-email-navasile@linux.microsoft.com> <11591275.oo6G3FHbOz@thomas> <20211109015923.GB12569@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Subject: Re: [dpdk-dev] [PATCH v16 2/9] eal: add thread attributes X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> 09/11/2021 02:59, Narcisa Ana Maria Vasile: > On Tue, Oct 12, 2021 at 06:12:21PM +0200, Thomas Monjalon wrote: > > 09/10/2021 09:41, Narcisa Ana Maria Vasile: > > > From: Narcisa Vasile <navasile@microsoft.com> > > > > > > Implement thread attributes for: > > > * thread affinity > > > * thread priority > > > Implement functions for managing thread attributes. > > > > > > Priority is represented through an enum that allows for two levels: > > > - RTE_THREAD_PRIORITY_NORMAL > > > - RTE_THREAD_PRIORITY_REALTIME_CRITICAL > > > > It doesn't say how do you translate these priorites in POSIX and win32. > > I'll send a new version with a better commit message. > Thread priorities on both Linux-based and Windows platforms are similarly > constructed from a class/policy + priority value. Currently in DPDK, most threads > operate at the OS-default priority level but there are cases when increasing the > priority is useful. For example, the Mellanox data path acceleration driver requires > realtime thread priority. Similarly, some Windows applications will require elevated > priority. It should not. We should not use realtime priority. > For these reasons, EAL will advertise 2 priority levels which are named suggestively > "normal" and "realtime_critical" and are computed as follows: > > For Linux and similar platforms: > * EAL "normal" priority corresponds to the (default) SCHED_OTHER policy + a priority value of > (sched_get_priority_min(SCHED_OTHER) + sched_get_priority_max(SCHED_OTHER))/2. > Note that on Linux the resulting priority value will be 0, > in accordance to the docs guidance that mention the value should be 0 for SCHED_OTHER policy. > > * EAL "realtime" priority corresponds to the SCHED_RR policy + a priority value of > sched_get_priority_max(SCHED_RR); > > For Windows: > * EAL "normal" corresponds to class NORMAL_PRIORITY_CLASS + > priority THREAD_PRIORITY_NORMAL > * EAL "realtime_critical" corresponds to class REALTIME_PRIORITY_CLASS + > priority THREAD_PRIORITY_TIME_CRITICAL