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 43C02423BA; Thu, 12 Jan 2023 22:41:53 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E0AE742D36; Thu, 12 Jan 2023 22:41:52 +0100 (CET) Received: from wout5-smtp.messagingengine.com (wout5-smtp.messagingengine.com [64.147.123.21]) by mails.dpdk.org (Postfix) with ESMTP id 9F8A142D27 for ; Thu, 12 Jan 2023 22:41:51 +0100 (CET) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.west.internal (Postfix) with ESMTP id A7C2732001FC; Thu, 12 Jan 2023 16:41:48 -0500 (EST) Received: from mailfrontend2 ([10.202.2.163]) by compute5.internal (MEProxy); Thu, 12 Jan 2023 16:41:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=monjalon.net; h= cc:cc:content-transfer-encoding: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=fm3; t=1673559708; x= 1673646108; bh=v34rkEhSMjE7XzLhgxFGqND/NmnZRSzRmDXnwKnLYTY=; b=L g5ZXYbzSjD5zvLOh+vDRI3No3xU8cQ8XLkioZ4mkobttBJ1sIeyfAr/Vt0Dfg1Sp gKEs/fpoeNBTZQG8/PtLBO95pvtlJblc+tXx+Mzm/t6yhhweWSCqdVUK/ozTtNl/ x1XrjOzLWj83I/8KyFCT7KCu4nMPgsKDSvC7UYFlnEJJ66dQ/FGsMLrw+t1FoD4p 8nv2+I2da5vWS8NqLIAOnNPwa3Je90wlcNsZKsu4ckU2tquZGaNYRuG7C2sJMNLT 0aiG/5+gMGg4vJM5m/NAkeswRq+5ZMGwk5K2Pk9+cWPp89iUE0pPixLKM6v53Nnc Lo+A85S2Wr++D/rGvWwwQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :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=fm3; t=1673559708; x= 1673646108; bh=v34rkEhSMjE7XzLhgxFGqND/NmnZRSzRmDXnwKnLYTY=; b=R CDBw6aF0YW2b+B+Eyvhc6o9NtbwG5UquML7yp1uUW1FWWB38TOvRiAIC3ZVPdfhd peL3f1D9VdYe446JhwgZucaH0PXj9rzsuzVMgwmPTORihm3/+38POIi3wdN7CPBn XdNDOCEoV7/PNETyvWCB3Tkm6/x0fnxuwfzW+O1hiWgQl0nImsOEWsnfgcoJ2GOg jxnUrs1tjcGYuMRHKKsS1ASe6JKgsDv0AXb33JEnEJRTd/o8MzMhfWsbdXIVBSst t00Fxr9+YT0unE/vajBrN9+eWGTIBM4Y7rHSmn2YnQy6yAJO2oC1X0T+J21ph3hp PpBLutGDpDUplCHYszo8w== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrleeigdduheefucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvvefufffkjghfggfgtgesthhqredttddtjeenucfhrhhomhepvfhhohhm rghsucfoohhnjhgrlhhonhcuoehthhhomhgrshesmhhonhhjrghlohhnrdhnvghtqeenuc ggtffrrghtthgvrhhnpeegtddtleejjeegffekkeektdejvedtheevtdekiedvueeuvdei uddvleevjeeujeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfh hrohhmpehthhhomhgrshesmhhonhhjrghlohhnrdhnvght X-ME-Proxy: Feedback-ID: i47234305:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 12 Jan 2023 16:41:46 -0500 (EST) From: Thomas Monjalon To: Konstantin Ananyev , Honnappa Nagarahalli , Amit Prakash Shukla Cc: dev@dpdk.org, Jerin Jacob Kollanukkaran , david.marchand@redhat.com, bruce.richardson@intel.com, ferruh.yigit@amd.com Subject: Re: [EXT] Re: [PATCH] ring: compilation fix with GCC-12 Date: Thu, 12 Jan 2023 22:41:45 +0100 Message-ID: <837071028.0ifERbkFSE@thomas> In-Reply-To: References: <20220805090348.1947658-1-amitprakashs@marvell.com> <2dee8dd1-dde5-6ef1-14d7-083c1bd9ab54@yandex.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" 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 23/08/2022 11:38, Amit Prakash Shukla: > From: Konstantin Ananyev > > 06/08/2022 19:35, Honnappa Nagarahalli =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > > >> Replacing memcpy with rte_memcpy fixes the GCC-12 compilation issue. > > >=20 > > > Any reason why this replacement fixes the problem? > > > Do you have any performance numbers with this change? > > > > > >> Also it would be better to change to rte_memcpy as the function is > > >> called in fastpath. > > >=20 > > > On Arm platforms, memcpy in the later versions has the best performan= ce. > >=20 > > I agree with Honnappa, it is better to keep memcpy() here. > > Actually what is strange - why it ends up in > > __rte_ring_dequeue_elems_128() at all? > > Inside rxa_intr_ring_dequeue() we clearly doing: rte_ring_dequeue(), wh= ich > > should boil down to ___rte_ring_dequeue_elems_64(). > > it should go to __rte_ring_dequeue_elems_128() at all. >=20 > I agree. After having close look and doing few experiments, > ideally it should not be going to __rte_ring_dequeue_elems_128(). > Sizeof(in call of rte_ring_enqueue_elem) gets evaluated at compile time > which in this case it is evaluated to 8 bytes so=20 > __rte_ring_dequeue_elems_128() shall not be in the path. Looks like more = of a gcc-12 bug.? >=20 > > Another q - is this warning happens only on arm platforms? >=20 > Warning is observed on x86 with build type as debug. > "meson --werror --buildtype=3Ddebug build" I confirm the compilation issue on x86 with GCC 12 in a debug build. We need to find a workaround. Is it reported to GCC already?