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([2804:1b3:a7c0:378:6793:1dc3:1346:d6d6]) by smtp.gmail.com with ESMTPSA id 4-20020a170902c14400b001d9fc535378sm1844083plj.236.2024.02.08.05.08.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Feb 2024 05:08:50 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org Cc: "H . J . Lu" , Noah Goldstein , Sajan Karumanchi , bmerry@sarao.ac.za, pmallapp@amd.com Subject: [PATCH v3 2/3] x86: Do not prefer ERMS for memset on Zen3+ Date: Thu, 8 Feb 2024 10:08:39 -0300 Message-Id: <20240208130840.533348-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240208130840.533348-1-adhemerval.zanella@linaro.org> References: <20240208130840.533348-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patch=linaro.org@sourceware.org For AMD Zen3+ architecture, the performance of the vectorized loop is slightly better than ERMS. Checked on x86_64-linux-gnu on Zen3. Reviewed-by: H.J. Lu --- sysdeps/x86/dl-cacheinfo.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h index f34d12846c..5a98f70364 100644 --- a/sysdeps/x86/dl-cacheinfo.h +++ b/sysdeps/x86/dl-cacheinfo.h @@ -1021,6 +1021,11 @@ dl_init_cacheinfo (struct cpu_features *cpu_features) minimum value is fixed. */ rep_stosb_threshold = TUNABLE_GET (x86_rep_stosb_threshold, long int, NULL); + if (cpu_features->basic.kind == arch_kind_amd + && !TUNABLE_IS_INITIALIZED (x86_rep_stosb_threshold)) + /* For AMD Zen3+ architecture, the performance of the vectorized loop is + slightly better than ERMS. */ + rep_stosb_threshold = SIZE_MAX; TUNABLE_SET_WITH_BOUNDS (x86_data_cache_size, data, 0, SIZE_MAX); TUNABLE_SET_WITH_BOUNDS (x86_shared_cache_size, shared, 0, SIZE_MAX);