{"id":120380,"date":"2024-10-28T19:09:10","date_gmt":"2024-10-28T17:09:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c"},"modified":"2026-02-08T18:56:03","modified_gmt":"2026-02-08T16:56:03","slug":"v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","title":{"rendered":"Le noyau Linux a optimis\u00e9 la mise en \u0153uvre de l'algorithme CRC32C","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pour l'inclusion dans la future branche du noyau Linux 6.13, un patch proposant une refonte de l'algorithme de calcul de la somme de contr\u00f4le CRC32C a \u00e9t\u00e9 sugg\u00e9r\u00e9. Le code de mise en \u0153uvre de CRC32C a \u00e9t\u00e9 r\u00e9duit d'environ 10 fois (de 4546 \u00e0 418 octets). Avec la protection retpoline d\u00e9sactiv\u00e9e contre les attaques de type Spectre, le gain de performance avec la nouvelle mise en \u0153uvre atteint 11,8 % sur les processeurs AMD Zen 2, 6,4 % \u2014 Intel Emerald Rapids et 4,8 % \u2014 Intel Haswell. Lorsque retpoline est activ\u00e9, l'augmentation de performance est plus marqu\u00e9e, atteignant 66,8 % sur les syst\u00e8mes avec des processeurs Intel Emerald Rapids, 35,0 % \u2014 Intel Haswell et 29,5 % \u2014 AMD Zen 2. retpoline activ\u00e9 | 512 | 833 | 1024 | 2000 | 3173 | 4096 | \u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+ Intel Haswell | 35.0 % | 20.7 % | 17.8 % | 9.7 % | -0.2 % | 4.4 % | Intel Emerald Rapids | 66.8 % | 45.2 % | 36.3 % | 19.3 % | 0.0 % | 5.4 % | AMD Zen 2 | 29.5 % | 17.2 % | 13.5 % | 8.6 % | -0.5 % | 2.8 % | retpoline d\u00e9sactiv\u00e9 : | 512 | 833 | 1024 | 2000 | 3173 | 4096 | \u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+ Intel Haswell | 3.3 % | 4.8 % | 4.5 % | 0.9 % | -2.9 % | 0.3 % | Intel Emerald Rapids | 7.5 % | 6.4 % | 5.2 % | 2.3 % | -0.0 % | 0.6 % | AMD Zen 2 | 11.8 % | 1.4 % | 0.2 % | 1.3 % | -0.9 % | -0.2 % | <\/p>\n

La version originale de CRC32C incluait 128 boucles d\u00e9roul\u00e9es (unroll), ce qui entra\u00eenait un code assez volumineux. Comme les processeurs modernes<\/a> capables d'ex\u00e9cuter des instructions hors d'ordre (out of order) peuvent ex\u00e9cuter des instructions en parall\u00e8le, une telle optimisation des branchements dans les boucles s'est r\u00e9v\u00e9l\u00e9e redondante et ne faisait qu'accro\u00eetre la taille du code. Au lieu de 128 it\u00e9rations, la nouvelle version n'en conserve que 4, ce qui a non seulement fortement r\u00e9duit la taille du code, mais a \u00e9galement acc\u00e9l\u00e9r\u00e9 l'ex\u00e9cution de l'op\u00e9ration.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0414\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u0431\u0443\u0434\u0443\u0449\u0435\u0439 \u0432\u0435\u0442\u043a\u0438 \u044f\u0434\u0440\u0430 Linux 6.13 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043f\u0430\u0442\u0447 \u0441 \u043f\u0435\u0440\u0435\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0439 \u0441\u0443\u043c\u043c\u044b CRC32C. \u041a\u043e\u0434 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 CRC32C \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0432 10 \u0440\u0430\u0437 (\u0441 4546 \u0434\u043e 418 \u0431\u0430\u0439\u0442). \u041f\u0440\u0438 \u0432\u044b\u043a\u043b\u044e\u0447\u0435\u043d\u043d\u043e\u0439 \u0437\u0430\u0449\u0438\u0442\u0435 retpoline \u043e\u0442 \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 Spectre \u043f\u0440\u0438\u0440\u043e\u0441\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043d\u043e\u0432\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u043e\u0441\u0442\u0438\u0433\u0430\u0435\u0442 11.8% \u043d\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 AMD Zen 2, 6.4% — […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-120380","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Le noyau Linux a optimis\u00e9 la mise en \u0153uvre de l'algorithme CRC32C | ProHoster","description":"Un patch a \u00e9t\u00e9 propos\u00e9 pour inclure dans la future version du noyau Linux 6.13, avec une r\u00e9\u00e9criture de l'algorithme de calcul de la somme de contr\u00f4le CRC32C. 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