{"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\/de\/blog\/novosti-interneta\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","title":{"rendered":"Die Implementierung des CRC32C-Algorithmus im Linux-Kernel wurde optimiert.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

F\u00fcr die zuk\u00fcnftige Kernversion 6.13 wurde ein Patch mit einer \u00fcberarbeiteten Implementierung des CRC32C-Pr\u00fcfzahlenalgorithmus vorgeschlagen. Der Code f\u00fcr die CRC32C-Implementierung wurde etwa um das Zehnfache reduziert (von 4546 auf 418 Bytes). Bei deaktiviertem Retpoline-Schutz vor Spectre-Angriffen betr\u00e4gt die Leistungssteigerung durch die neue Implementierung auf AMD Zen 2 Prozessoren 11,8 %, auf Intel Emerald Rapids 6,4 % und auf Intel Haswell 4,8 %. Bei aktivem Retpoline ist die Leistungssteigerung deutlicher und erreicht 66,8 % auf Systemen mit Intel Emerald Rapids Prozessoren, 35,0 % auf Intel Haswell und 29,5 % auf AMD Zen 2. retpoline aktiviert | 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 deaktiviert: | 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

Die urspr\u00fcngliche Version von CRC32C umfasste 128 entrollte Schleifen (unroll), was zu einem ziemlich gro\u00dfen Code f\u00fchrte. Da moderne Prozessoren<\/a> Mit Unterst\u00fctzung f\u00fcr die Ausf\u00fchrung von Befehlen nicht in der Reihenfolge (out of order) k\u00f6nnen Befehle parallel ausgef\u00fchrt werden. Eine solche Optimierung von Sprungbefehlen in Schleifen erwies sich als \u00fcberfl\u00fcssig und f\u00fchrte nur zu \u00fcberm\u00e4\u00dfig umfangreichem Code. Anstelle von 128 Iterationen wurden im neuen Ansatz nur 4 beibehalten, was nicht nur das Codevolumen erheblich reduzierte, sondern auch die Ausf\u00fchrung der Operation beschleunigte.
\n
Quelle: 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-novosti-interneta"],"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\udd47Im Linux-Kernel wurde die Implementierung des CRC32C-Algorithmus optimiert | ProHoster","description":"F\u00fcr die k\u00fcnftige Version des Linux-Kernels 6.13 wurde ein Patch mit einer \u00fcberarbeiteten Implementierung des CRC32C-Pr\u00fcfzahlenalgorithmus vorgeschlagen. Der Code f\u00fcr die CRC32C-Implementierung wurde um etwa das 10-fache verkleinert (von 4546 auf 418 Bytes). Bei deaktiviertem Schutz retpoline vor Spectre-Angriffen erreicht die Leistung mit der neuen Implementierung eine Steigerung von 11,8 % auf AMD Zen 2 Prozessoren, 6,4 % -","canonical_url":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"de_DE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412 \u044f\u0434\u0440\u0435 Linux \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f 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