{"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\/hr\/blog\/news\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","title":{"rendered":"U Linux kernelu optimizirana je implementacija algoritma CRC32C.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Za uklju\u010divanje u budu\u0107u granu jezgre Linux 6.13, predlo\u017een je patch s revidiranom implementacijom algoritma za izra\u010dunavanje kontrolne sume CRC32C. Kod implementacije CRC32C smanjen je otprilike 10 puta (s 4546 na 418 bajtova). Kada je za\u0161tita retpoline isklju\u010dena, pove\u0107anje performansi kori\u0161tenjem nove implementacije dose\u017ee 11.8% na AMD Zen 2 procesorima, 6.4% \u2014 Intel Emerald Rapids i 4.8% Intel Haswell. Kada je retpoline uklju\u010den, pove\u0107anje performansi je jo\u0161 izra\u017eenije i dose\u017ee 66.8% na sustavima s Intel Emerald Rapids procesorima, 35.0% \u2014 Intel Haswell i 29.5% \u2014 AMD Zen 2. retpoline enabled | 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+ 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 disabled: | 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+ 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

Izvorna verzija CRC32C uklju\u010divala je 128 razra\u0111enih ciklusa (unroll), \u0161to je dovodilo do prili\u010dno velikog koda. Budu\u0107i da moderni procesori<\/a> s podr\u0161kom za izvr\u0161enje instrukcija izvan reda (out of order) mogu izvoditi naredbe paralelno, takva optimizacija naredbi skakanja u ciklusima postala je suvi\u0161na i dovela je samo do prekomjernog koda. Umjesto 128 iteracija, u novoj verziji ostavljeno je samo 4, \u0161to nije samo zna\u010dajno smanjilo volumen koda, nego je i ubrzalo izvo\u0111enje operacije.
\n
Izvor: 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\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\udd47U Linux jezgri optimizirana je implementacija algoritma CRC32C | ProHoster","description":"Kako bi se uklju\u010dio u budu\u0107u granu Linux jezgre 6.13, predlo\u017een je zakrpa s revidiranom implementacijom algoritma za izra\u010dunavanje kontrolnog zbroja CRC32C. 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