{"id":120511,"date":"2024-11-06T19:09:06","date_gmt":"2024-11-06T17:09:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/arhitektura-nabora-komand-bpf-poluchila-status-predlozhennogo-standarta"},"modified":"2024-11-06T19:09:06","modified_gmt":"2024-11-06T17:09:06","slug":"arhitektura-nabora-komand-bpf-poluchila-status-predlozhennogo-standarta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/arhitektura-nabora-komand-bpf-poluchila-status-predlozhennogo-standarta","title":{"rendered":"Architektura zestawu polece\u0144 BPF uzyska\u0142a status proponowanego standardu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Komitet IETF (Internet Engineering Task Force), zajmuj\u0105cy si\u0119 rozwojem protoko\u0142\u00f3w i architektury internetu, zako\u0144czy\u0142 tworzenie RFC dla architektury zestawu polece\u0144 BPF i opublikowa\u0142 zwi\u0105zan\u0105 z tym specyfikacj\u0119 pod identyfikatorem RFC 9669. RFC uzyska\u0142 status \u201eProponowanego standardu\u201d, po czym rozpocznie si\u0119 praca nad nadaniem RFC statusu standardu roboczego (Draft Standard), co w praktyce oznacza pe\u0142n\u0105 stabilizacj\u0119 i uwzgl\u0119dnienie wszystkich zg\u0142oszonych uwag. <\/p>\n

Opublikowana specyfikacja opisuje zestaw instrukcji bajtkodowych BPF i niskopoziomow\u0105 maszyn\u0119 wirtualn\u0105, stosowan\u0105 w podsystemie j\u0105dra Linux eBPF do wykonywania zewn\u0119trznych procesor\u00f3w, kt\u00f3re mog\u0105 w czasie rzeczywistym zmieni\u0107 zachowanie systemu bez potrzeby zmiany kodu j\u0105dra. W rzeczywisto\u015bci eBPF wdra\u017ca najprostszy wirtualny procesor z w\u0142asnym zestawem rejestr\u00f3w, instrukcjami podobnymi do RISC, stosem i licznikiem instrukcji. Programy BPF zwykle tworzone s\u0105 w podzbiorze j\u0119zyka C, a nast\u0119pnie kompilowane do bajtkodu, nadaj\u0105cego si\u0119 do wykonania w maszynie wirtualnej<\/a>. Maszyna wirtualna mo\u017ce wykonywa\u0107 programy BPF zar\u00f3wno z u\u017cyciem interpretacji, jak i stosuj\u0105c kompilacj\u0119 JIT do t\u0142umaczenia bajtkodu w czasie rzeczywistym na instrukcje maszynowe. <\/p>\n

Zak\u0142ada si\u0119, \u017ce standaryzacja architektury zestawu polece\u0144 BPF b\u0119dzie bod\u017acem do tworzenia zewn\u0119trznych realizacji, zgodnych z maszyn\u0105 wirtualn\u0105 eBPF i zdolnych do wykonywania program\u00f3w BPF napisanych dla j\u0105dra Linux. N nad tworzeniem takich maszyn wirtualnych<\/a> pracuj\u0105 niekt\u00f3rzy producenci adapter\u00f3w sieciowych, rozwijaj\u0105cy narz\u0119dzia do sprz\u0119towego przyspieszania wykonywania procesor\u00f3w BPF dla pakiet\u00f3w sieciowych. Idea polega na rozszerzeniu mo\u017cliwo\u015bci podsystemu XDP (eXpress Data Path) do wykonywania program\u00f3w BPF nie tylko na poziomie sterownika sieciowego, ale tak\u017ce po stronie karty sieciowej. <\/p>\n

Na przyk\u0142ad firma Netronome doda\u0142a wsparcie dla BPF w adapterze Netronome Agilio CX SmartNIC i udost\u0119pni\u0142a kolekcj\u0119 przyk\u0142ad\u00f3w uniwersalnych program\u00f3w BPF, kt\u00f3re mog\u0105 by\u0107 wykonywane nie tylko za pomoc\u0105 CPU w j\u0105drze z dowolnym sterownikiem zgodnym z XDP, ale tak\u017ce po stronie karty sieciowej, co pozwala na podejmowanie decyzji o odrzucaniu, modyfikacji lub przekierowywaniu pakiet\u00f3w bez zu\u017cywania zasob\u00f3w CPU. Oddzielnie rozwija si\u0119 technologia XRP (eXpress Resubmission Path), pozwalaj\u0105ca na wykorzystanie BPF do przeniesienia niekt\u00f3rych operacji z dyskami NVMe, takich jak prace z indeksami i agregacja danych, na poziom sterownika NVMe lub zewn\u0119trzne urz\u0105dzenie. <\/p>\n

Zauwa\u017cono, \u017ce szerszemu wdro\u017ceniu podobnych mo\u017cliwo\u015bci do tej pory przeszkadza\u0142y ryzyka zwi\u0105zane z naruszeniem zgodno\u015bci oraz konieczno\u015bci\u0105 \u015bledzenia stanu eBPF w j\u0105drze. Z powodu tych ryzyk niekt\u00f3rzy producenci od\u0142o\u017cyli wdro\u017cenie \u015brodk\u00f3w sprz\u0119towego przyspieszenia BPF w swoich urz\u0105dzeniach do chwil, gdy powstanie standard.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-120511","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\udd47Architektura zestawu komend BPF uzyska\u0142a status proponowanego standardu | ProHoster","description":"Komitet IETF (Internet Engineering Task Force), zajmuj\u0105cy si\u0119 rozwojem protoko\u0142\u00f3w i architektury internetu, zako\u0144czy\u0142 tworzenie RFC dla architektury zestawu polece\u0144 BPF i opublikowa\u0142 z nim powi\u0105zan\u0105 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