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Wed, 24 Jun 2020 02:24:07 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyhJfpYC1qk/Z6CwJ/kCI4a09c5q7P1tP+I8LsqMUcff/jUnGHQ5pWcN2E1TGxfjXdk8Sr+A+dpljB/Io10ERQ= X-Received: by 2002:a67:26c2:: with SMTP id m185mr7545765vsm.39.1592990646898; Wed, 24 Jun 2020 02:24:06 -0700 (PDT) MIME-Version: 1.0 References: <20200610144506.30505-1-david.marchand@redhat.com> <20200622132531.21857-1-david.marchand@redhat.com> <20200622132531.21857-7-david.marchand@redhat.com> <BYAPR11MB33010EBC5471E7157AA664359A970@BYAPR11MB3301.namprd11.prod.outlook.com> <CAJFAV8y_X_7K+vxXz1xT5V1RPY9R_hAdLTCBBgiexKtvdESjng@mail.gmail.com> <BYAPR11MB3301F1258A2D4B38A79E1CA79A940@BYAPR11MB3301.namprd11.prod.outlook.com> In-Reply-To: <BYAPR11MB3301F1258A2D4B38A79E1CA79A940@BYAPR11MB3301.namprd11.prod.outlook.com> From: David Marchand <david.marchand@redhat.com> Date: Wed, 24 Jun 2020 11:23:55 +0200 Message-ID: <CAJFAV8zCHKNnUpnm0V2pzsnEOA2hYNampgOAgCsMSV5487U8+A@mail.gmail.com> To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com> Cc: "dev@dpdk.org" <dev@dpdk.org>, "jerinjacobk@gmail.com" <jerinjacobk@gmail.com>, "Richardson, Bruce" <bruce.richardson@intel.com>, "mdr@ashroe.eu" <mdr@ashroe.eu>, "ktraynor@redhat.com" <ktraynor@redhat.com>, "Stokes, Ian" <ian.stokes@intel.com>, "i.maximets@ovn.org" <i.maximets@ovn.org>, Thomas Monjalon <thomas@monjalon.net>, "Mcnamara, John" <john.mcnamara@intel.com>, "Kovacevic, Marko" <marko.kovacevic@intel.com>, "Burakov, Anatoly" <anatoly.burakov@intel.com>, Olivier Matz <olivier.matz@6wind.com>, Andrew Rybchenko <arybchenko@solarflare.com>, Neil Horman <nhorman@tuxdriver.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Subject: Re: [dpdk-dev] [PATCH v3 6/9] eal: register non-EAL threads as lcores X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 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> On Tue, Jun 23, 2020 at 3:16 PM Ananyev, Konstantin <konstantin.ananyev@intel.com> wrote: > > Even before this series, MP has no protection on lcore placing between > > primary and secondary processes. > > Agree, it is not a new problem, it has been there for a while. > Though making lcore assignment dynamic will make it more noticeable and harder to avoid. > With static only lcore distribution it is much easier to control things. > > > Personally, I have no use for DPDK MP and marking MP as not supporting > > this new feature is tempting for a first phase. > > If this is a strong requirement, I can look at it in a second phase. > > What do you think? > > In theory it is possible to mark this new API as not supported for MP. > At least for now. Though I think it is sort of temporal solution. > AFAIK, MP is used by customers, so sooner or later someone will hit that problem. I understand this argument. But then we don't see those customers giving feedback. > Let say, we do have pdump app/library in our mainline. > As I can see - it will be affected when users will start using this new dynamic lcore API > inside their apps. Supporting lcore allocation in MP requires exchanges between primary/secondary processes like what we have for memory allocations. It will be quite a beast to get to work fine, while not even knowing if people actually want to use both. For v4, I added a check to exclude MP and the new API. I am still willing to help if people do care about using both features together. -- David Marchand