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[204.195.33.123]) by smtp.gmail.com with ESMTPSA id z12sm11377597pjd.39.2021.07.17.18.08.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Jul 2021 18:08:06 -0700 (PDT) Date: Sat, 17 Jul 2021 18:08:04 -0700 From: Stephen Hemminger <stephen@networkplumber.org> To: Liang Ma <liangma@liangbit.com> Cc: dev@dpdk.org, yi.rong@intel.com, Liang Ma <liangma@bytedance.com>, stable@dpdk.org, Bruce Richardson <bruce.richardson@intel.com>, Konstantin Ananyev <konstantin.ananyev@intel.com> Message-ID: <20210717180804.301f7876@hermes.local> In-Reply-To: <20210717221304.GA45@DESKTOP-POQV63C.localdomain> References: <20210717170830.1736-1-liangma@liangbit.com> <20210717104849.2ec6526e@hermes.local> <20210717221304.GA45@DESKTOP-POQV63C.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] buildtools: Check GCC version to avoid GCC 6.3.0 avx512 bug X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches <stable.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/stable>, <mailto:stable-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/stable/> List-Post: <mailto:stable@dpdk.org> List-Help: <mailto:stable-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/stable>, <mailto:stable-request@dpdk.org?subject=subscribe> Errors-To: stable-bounces@dpdk.org Sender: "stable" <stable-bounces@dpdk.org> On Sat, 17 Jul 2021 23:13:04 +0100 Liang Ma <liangma@liangbit.com> wrote: > On Sat, Jul 17, 2021 at 10:48:49AM -0700, Stephen Hemminger wrote: > > On Sat, 17 Jul 2021 18:08:30 +0100 > > Liang Ma <liangma@liangbit.com> wrote: > > > > > From: Liang Ma <liangma@bytedance.com> > > > > > > GCC 6.3.0 has a known bug which related to _mm512_extracti64x4_epi64. > > > Please reference https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82887 > > > > > > Some DPDK PMD avx512 version heavily use _mm512_extracti64x4_epi6, > > > which casue building failure with debug buildtype. > > > > > > Therefore, it's helpful to disable avx512 for GCC 6.3.0 > > > > > > Bugzilla ID: 717 > > > Fixes: e6a6a138919f (net/i40e: add AVX512 vector path) > > > Fixes: 808a17b3c1e6 (net/ice: add Rx AVX512 offload path) > > > Fixes: 4b64ccb328c9 (net/iavf: fix VLAN extraction in AVX512 path) > > > Cc: stable@dpdk.org > > > > > > Reported-by: Liang Ma <liangma@liangbit.com> > > > Signed-off-by: Liang Ma <liangma@bytedance.com> > > > > What distro still has GCC 6.3.0? > For example Debian 9.x Ok, thanks. Is there a bug fix in Debian LTS yet?