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([2804:1b3:a7c0:378:b5ab:9c4b:bdc3:2870]) by smtp.gmail.com with ESMTPSA id d22-20020aa78696000000b006e04a659ed6sm2248598pfo.67.2024.02.06.09.43.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Feb 2024 09:43:32 -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 v2 2/3] x86: Do not prefer ERMS for memset on Zen3+ Date: Tue, 6 Feb 2024 14:43:21 -0300 Message-Id: <20240206174322.2317679-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240206174322.2317679-1-adhemerval.zanella@linaro.org> References: <20240206174322.2317679-1-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. --- sysdeps/x86/dl-cacheinfo.h | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h index 74b804c5e6..f2cd6f179d 100644 --- a/sysdeps/x86/dl-cacheinfo.h +++ b/sysdeps/x86/dl-cacheinfo.h @@ -1010,11 +1010,17 @@ dl_init_cacheinfo (struct cpu_features *cpu_features) if (tunable_size > minimum_rep_movsb_threshold) rep_movsb_threshold = tunable_size; - /* NB: The default value of the x86_rep_stosb_threshold tunable is the - same as the default value of __x86_rep_stosb_threshold and the - minimum value is fixed. */ - rep_stosb_threshold = TUNABLE_GET (x86_rep_stosb_threshold, - long int, NULL); + /* For AMD Zen3+ architecture, the performance of the vectorized loop is + slightly better than ERMS. */ + if (cpu_features->basic.kind == arch_kind_amd) + rep_stosb_threshold = SIZE_MAX; + + if (TUNABLE_IS_INITIALIZED (x86_rep_stosb_threshold)) + /* NB: The default value of the x86_rep_stosb_threshold tunable is the + same as the default value of __x86_rep_stosb_threshold and the + minimum value is fixed. */ + rep_stosb_threshold = TUNABLE_GET (x86_rep_stosb_threshold, + long int, NULL); TUNABLE_SET_WITH_BOUNDS (x86_data_cache_size, data, 0, SIZE_MAX); TUNABLE_SET_WITH_BOUNDS (x86_shared_cache_size, shared, 0, SIZE_MAX);