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Wed, 11 Oct 2023 18:49:06 -0400 (EDT) From: Thomas Monjalon <thomas@monjalon.net> To: Morten =?ISO-8859-1?Q?Br=F8rup?= <mb@smartsharesystems.com> Cc: Mattias =?ISO-8859-1?Q?R=F6nnblom?= <hofors@lysator.liu.se>, Stephen Hemminger <stephen@networkplumber.org>, dev@dpdk.org, david.marchand@redhat.com, mattias.ronnblom@ericsson.com, bruce.richardson@intel.com, olivier.matz@6wind.com, andrew.rybchenko@oktetlabs.ru, honnappa.nagarahalli@arm.com, konstantin.v.ananyev@yandex.ru Subject: Re: [PATCH] eal: add cache guard to per-lcore PRNG state Date: Thu, 12 Oct 2023 00:49:03 +0200 Message-ID: <2624731.k3LOHGUjKi@thomas> In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35E9EF2B@smartserver.smartshare.dk> References: <20230904092632.12675-1-mb@smartsharesystems.com> <4539298.cEBGB3zze1@thomas> <98CBD80474FA8B44BF855DF32C47DC35E9EF2B@smartserver.smartshare.dk> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" 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 11/10/2023 18:55, Morten Br=F8rup: > > From: Thomas Monjalon [mailto:thomas@monjalon.net] > > Sent: Wednesday, 11 October 2023 18.08 > >=20 > > TLS is an alternative solution proposed by Stephen. > > What do you think? >=20 > I think we went down a rabbit hole - which I admit to enjoy. :-) There is no reply/explanation in this thread. > My simple patch should be applied, with the description improved by Matti= as: >=20 > The per-lcore random state is frequently updated by their individual > lcores, so add a cache guard to prevent false sharing in case the > CPU employs a next-N-lines (or similar) hardware prefetcher. OK applied