From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id C321442369; Thu, 12 Oct 2023 00:49:13 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 903E5402BE; Thu, 12 Oct 2023 00:49:13 +0200 (CEST) Received: from out4-smtp.messagingengine.com (out4-smtp.messagingengine.com [66.111.4.28]) by mails.dpdk.org (Postfix) with ESMTP id 25E3F402BB for ; Thu, 12 Oct 2023 00:49:12 +0200 (CEST) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id 28CF35C03A1; Wed, 11 Oct 2023 18:49:09 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute5.internal (MEProxy); Wed, 11 Oct 2023 18:49:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=monjalon.net; h= cc:cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:sender:subject:subject:to:to; s=fm2; t= 1697064549; x=1697150949; bh=BgNkHj4fKmicWfZIF8x0WHOtaPuT8YlL2YJ JTAbqirA=; b=STOrHZZnf3tpr5O7JLtxjwWwBJ3sBZNXOgxk47tgPeFVOAAwGp7 8Q33zHbwA852JSguoXKqezwsXfX2xspKcD/VmWmb/qJWfnY+iIQgnRdu99FLQgsZ uBkF7lP5SQo2Hc0aXxeZJM9KnoKNu4dI2O605nJO/qCYl3+lOq+gUcTY/bgjRTch G900t3Z36X3huww9eXySe5igDP5Rif6XN/Lkt9dgwtCkO9dk03j0VSoFx4WpnU2J LlmPrlfj9CjqHOH6cV0Mwi5r7vrnkok7e1dh+wrpjcUfAMgFKeLXEqkHzo6MhMwY GgKosBsm2j+eXo/BD1vak9q0JTGzMUxAtqg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:sender:subject:subject:to:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; t= 1697064549; x=1697150949; bh=BgNkHj4fKmicWfZIF8x0WHOtaPuT8YlL2YJ JTAbqirA=; b=MdJ7eAh4Z8nS+Io4g2DmQNOPvZ6eRpK/A6u/bl/rvQUphtlDYhS Q4+EqhGUplA6MiJmmAmzCtODufspM6CpajUEUkuFxas41/hLI7tjxyIhMMLlmPMo sJCzKs1qK+3myYCoamoXLV1o56SCGo1RB8trlwSdmjCHViipzsoTxQyvk9SbBbtg mnS7C8luRSCJvT6WObHjE9D/qgJTTgR14BOS9FRq/Ps+ZRziDjjrxFrfTxLG9miR qfYfwxml75Dpkxkyg6VcVK7pHwd45rQ04bWbp00aUS/qLfQNtRAV30kpWGOc8nhy VI7gI7KEabWLjI0e35mkyW8r0mmFzuxGe2w== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvkedrheelgdduvdcutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefhvfevufffkfgjfhgggfgtsehtqhertddttddunecuhfhrohhmpefvhhhomhgr shcuofhonhhjrghlohhnuceothhhohhmrghssehmohhnjhgrlhhonhdrnhgvtheqnecugg ftrfgrthhtvghrnhepfefhjeeluedvvedtuddtuedtvefhieejtefhffeujefhteduudev tdektdeikeffnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrh homhepthhhohhmrghssehmohhnjhgrlhhonhdrnhgvth X-ME-Proxy: Feedback-ID: i47234305:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 11 Oct 2023 18:49:06 -0400 (EDT) From: Thomas Monjalon To: Morten =?ISO-8859-1?Q?Br=F8rup?= Cc: Mattias =?ISO-8859-1?Q?R=F6nnblom?= , Stephen Hemminger , 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-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