Se ha propuesto un parche con una implementaci\u00f3n revisada del algoritmo de c\u00e1lculo de la suma de verificaci\u00f3n CRC32C para su inclusi\u00f3n en la futura rama del n\u00facleo Linux 6.13. El c\u00f3digo de implementaci\u00f3n de CRC32C se ha reducido aproximadamente en 10 veces (de 4546 a 418 bytes). Con la protecci\u00f3n retpoline desactivada contra ataques de tipo Spectre, el incremento en el rendimiento al utilizar la nueva implementaci\u00f3n alcanza el 11.8% en los procesadores AMD Zen 2, 6.4% en Intel Emerald Rapids y 4.8% en Intel Haswell. Al activar retpoline, el aumento del rendimiento es m\u00e1s notable y alcanza el 66.8% en sistemas con procesadores Intel Emerald Rapids, 35.0% en Intel Haswell y 29.5% en AMD Zen 2. retpoline habilitado | 512 | 833 | 1024 | 2000 | 3173 | 4096 | ----+----+----+----+----+----+ 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 deshabilitado: | 512 | 833 | 1024 | 2000 | 3173 | 4096 | ----+----+----+----+----+----+ 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 versi\u00f3n original de CRC32C inclu\u00eda 128 ciclos desplegados (unroll), lo que result\u00f3 en un c\u00f3digo bastante grande. Dado que los procesadores modernos<\/a> con soporte para la ejecuci\u00f3n de instrucciones fuera de orden (out of order) pueden ejecutar comandos en paralelo, dicha optimizaci\u00f3n de los saltos en ciclos result\u00f3 excesiva y solo produc\u00eda un c\u00f3digo demasiado grande. En lugar de 128 iteraciones, en la nueva versi\u00f3n se dejaron solo 4, lo que no solo redujo dr\u00e1sticamente el tama\u00f1o del c\u00f3digo, sino que tambi\u00e9n aceler\u00f3 la ejecuci\u00f3n de la operaci\u00f3n. \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\udd47 Se ha optimizado la implementaci\u00f3n del algoritmo CRC32C en el n\u00facleo Linux | ProHoster","description":"Se ha propuesto un parche con una implementaci\u00f3n revisada del algoritmo de c\u00e1lculo de la suma de verificaci\u00f3n CRC32C para incluirlo en la pr\u00f3xima rama del n\u00facleo Linux 6.13. 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Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"