{"id":101359,"date":"2021-09-21T22:22:43","date_gmt":"2021-09-21T20:22:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predstavlen-modul-yadra-sposobnyj-v-razy-uskorit-openvpn"},"modified":"2021-09-21T22:22:43","modified_gmt":"2021-09-21T20:22:43","slug":"predstavlen-modul-yadra-sposobnyj-v-razy-uskorit-openvpn","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/predstavlen-modul-yadra-sposobnyj-v-razy-uskorit-openvpn","title":{"rendered":"Kernemodulet, der kan accelerere OpenVPN betydeligt, er blevet pr\u00e6senteret","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Udviklerne af OpenVPN-pakken til oprettelse af virtuelle private netv\u00e6rk har pr\u00e6senteret ovpn-dco-kernemodulet, der potentielt kan betydeligt forbedre VPN-ydeevnen. Selvom modulet stadig er under udvikling med fokus p\u00e5 linux-next-grenen og har status som eksperimentelt, har det allerede n\u00e5et et stabilitetsniveau, der g\u00f8r det muligt at implementere det i OpenVPN Cloud-tjenesten. <\/p>\n

Sammenlignet med konfigurationen baseret p\u00e5 tun-interface har anvendelsen af modulet p\u00e5 klient- og serversiden, n\u00e5r AES-256-GCM-kryptering anvendes, givet en stigning i b\u00e5ndbredden med 8 gange (fra 370 Mbit\/s til 2950 Mbit\/s). Ved kun at anvende modulet p\u00e5 klientsiden er b\u00e5ndbredden steget tre gange for udg\u00e5ende trafik og er u\u00e6ndret for indg\u00e5ende trafik. N\u00e5r modulet anvendes kun p\u00e5 den ene side, server<\/a> b\u00e5ndbredden er steget 4 gange for indg\u00e5ende trafik og med 35% for udg\u00e5ende.

\"Kernemodulet,<\/center> <\/p>\n

Accelerationen opn\u00e5s ved at flytte alle krypteringsoperationer, pakkeprocessering og kommunikationskanaladministration til Linux-kernen, hvilket fjerner overhead omkostningerne ved kontekstskift, giver mulighed for optimering gennem direkte adgang til kernen's interne API og eliminerer langsom dataoverf\u00f8rsel mellem kernen og brugerrummet (kryptering, dekryptering og routing udf\u00f8res af modulet uden at sende trafik til brugeroperationsbehandleren). <\/p>\n

Det bem\u00e6rkes, at de negative virkninger p\u00e5 ydeevnen VPN<\/a> prim\u00e6rt skyldes ressourcekr\u00e6vende krypteringsoperationer og forsinkelser for\u00e5rsaget af kontekstskift. For at accelerere krypteringen har CPU-udvidelser som Intel AES-NI v\u00e6ret anvendt, men kontekstskift forblev et flaskehalsproblem indtil ovpn-dco. Udover at anvende de instrukser, som processoren leverer, til at accelerere krypteringen, er der i ovpn-dco-modulet desuden sikret opdeling af krypteringsoperationerne i separate segmenter og deres behandling i multitr\u00e5dede tilstande, hvilket muligg\u00f8r udnyttelse af alle tilg\u00e6ngelige CPU-kerner. <\/p>\n

Fra de nuv\u00e6rende implementeringsbegr\u00e6nsninger, som i fremtiden vil blive fjernet, fremh\u00e6ves kun underst\u00f8ttelse af AEAD- og 'none' (uden autentificering) tilstande samt cipher AES-GCM og CHACHA20POLY1305. Underst\u00f8ttelse af DCO planl\u00e6gges at blive inkluderet i OpenVPN 2.6, som er planlagt til 4. kvartal i \u00e5r. I \u00f8jeblikket underst\u00f8ttes modulet i den igangv\u00e6rende beta-test af Linux-klienten OpenVPN3 og i eksperimentelle versioner af OpenVPN-serveren til Linux. Et lignende modul, ovpn-dco-win, er ogs\u00e5 under udvikling til Windows-kernen.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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