{"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\/it\/blog\/novosti-interneta\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","title":{"rendered":"\u00c8 stata ottimizzata l'implementazione dell'algoritmo CRC32C nel kernel Linux.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00c8 stato proposto un patch per l'inclusione nel futuro ramo del kernel Linux 6.13, con una ristrutturazione dell'implementazione dell'algoritmo di calcolo del checksum CRC32C. Il codice dell'implementazione di CRC32C \u00e8 stato ridotto di circa 10 volte (da 4546 a 418 byte). Con la protezione retpoline disattivata contro attacchi di tipo Spectre, l'aumento delle prestazioni utilizzando la nuova implementazione raggiunge il 11,8% sui processori AMD Zen 2, il 6,4% sugli Intel Emerald Rapids e il 4,8% sugli Intel Haswell. Con il retpoline attivato, il guadagno prestazionale \u00e8 pi\u00f9 evidente e raggiunge il 66,8% sui sistemi con processori Intel Emerald Rapids, il 35,0% sugli Intel Haswell e il 29,5% sugli 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\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\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 versione originale del CRC32C includeva 128 cicli srotolati (unroll), il che portava a un codice piuttosto grande. Poich\u00e9 i processori moderni<\/a> Con il supporto per l'esecuzione di istruzioni non in ordine (out of order), possono eseguire comandi in parallelo. Questa ottimizzazione dei comandi di salto nei cicli si \u00e8 rivelata superflua e ha portato solo a un codice eccessivamente lungo. Invece di 128 iterazioni, nella nuova versione sono state mantenute solo 4, il che non solo ha notevolmente ridotto il volume del codice, ma ha anche accelerato l'esecuzione dell'operazione.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Il codice di implementazione di CRC32C \u00e8 stato ridotto di circa 10 volte (da 4546 a 418 byte). Con la protezione retpoline disattivata contro gli attacchi di tipo Spectre, l'aumento delle prestazioni con l'uso della nuova implementazione pu\u00f2 raggiungere l'11,8% sui processori AMD Zen 2, 6,4% -","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/v-yadre-linux-optimizirovana-realizacziya-algoritma-crc32c","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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 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