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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71e2ab0fcf4sm2621781b3a.219.2024.10.11.07.23.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Oct 2024 07:23:28 -0700 (PDT) Date: Fri, 11 Oct 2024 07:23:26 -0700 From: Stephen Hemminger <stephen@networkplumber.org> To: Mattias =?UTF-8?B?UsO2bm5ibG9t?= <mattias.ronnblom@ericsson.com> Cc: <dev@dpdk.org>, <hofors@lysator.liu.se>, Morten =?UTF-8?B?QnLDuHJ1cA==?= <mb@smartsharesystems.com>, Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>, David Marchand <david.marchand@redhat.com>, Jerin Jacob <jerinj@marvell.com>, Luka Jankovic <luka.jankovic@ericsson.com> Subject: Re: [PATCH v8 0/7] Lcore variables Message-ID: <20241011072326.4a2ec420@hermes.local> In-Reply-To: <20241010141349.813088-1-mattias.ronnblom@ericsson.com> References: <20240918082614.725220-2-mattias.ronnblom@ericsson.com> <20241010141349.813088-1-mattias.ronnblom@ericsson.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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 On Thu, 10 Oct 2024 16:13:42 +0200 Mattias R=C3=B6nnblom <mattias.ronnblom@ericsson.com> wrote: > This patch set introduces a new API <rte_lcore_var.h> for static > per-lcore id data allocation. >=20 > Please refer to the <rte_lcore_var.h> API documentation for both a > rationale for this new API, and a comparison to the alternatives > available. >=20 > The adoption of this API would affect many different DPDK modules, but > the author updated only a few, mostly to serve as examples in this > RFC, and to iron out some, but surely not all, wrinkles in the API. >=20 > The question on how to best allocate static per-lcore memory has been > up several times on the dev mailing list, for example in the thread on > "random: use per lcore state" RFC by Stephen Hemminger. >=20 > Lcore variables are surely not the answer to all your per-lcore-data > needs, since it only allows for more-or-less static allocation. In the > author's opinion, it does however provide a reasonably simple and > clean and seemingly very much performant solution to a real problem. There should be a mention about whether this storage can be shared with other threads and processes. Is it like huge page memory or stack or heap?