{"id":75939,"date":"2020-03-29T19:42:19","date_gmt":"2020-03-29T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kompaniya-cloudflare-podgotovila-patchi-kardinalno-uskoryayushhie-diskovoe-shifrovanie-v-linux"},"modified":"2020-03-29T19:42:19","modified_gmt":"2020-03-29T17:42:19","slug":"kompaniya-cloudflare-podgotovila-patchi-kardinalno-uskoryayushhie-diskovoe-shifrovanie-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/kompaniya-cloudflare-podgotovila-patchi-kardinalno-uskoryayushhie-diskovoe-shifrovanie-v-linux","title":{"rendered":"Ettev\u00f5te Cloudflare on valmistanud parandused, mis kiirendavad oluliselt kettakr\u00fcptimist Linuxis.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Cloudflare'i arendajad <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.cloudflare.com\/speeding-up-linux-disk-encryption\/\">r\u00e4\u00e4kinud<\/a><\/noindex> teatasid t\u00f6\u00f6st, mis keskendub Linuxi tuuma kettasalvestamise kr\u00fcpteerimise j\u00f5udluse optimeerimisele. Tulemuseks on valmistatud <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/linux\/tree\/master\/patches\">pat\u0161id<\/a><\/noindex> alam s\u00fcsteemile <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/cryptsetup\/cryptsetup\/-\/wikis\/DMCrypt\">dm-crypt<\/a><\/noindex> ja Crypto API, mis v\u00f5imaldasid s\u00fcnteetilises testis t\u00f5sta lugemise ja kirjutamise l\u00e4bilaskev\u00f5imet rohkem kui kaks korda ning poole v\u00f5rra v\u00e4hendada viivitusi. Reaalsete seadmetega testimise k\u00e4igus \u00f5nnestus kr\u00fcpteerimise kulusid v\u00e4hendada praktiliselt samale tasemele, mis on t\u00e4heldatud ketta kasutamisel ilma andmete kr\u00fcpteerimiseta.<\/p>\n<p>Cloudflare kasutab dm-crypt'i andmete kr\u00fcpteerimiseks salvestites, mida kasutatakse sisu vahem\u00e4llu salvestamiseks CDN-v\u00f5rgus. Dm-crypt t\u00f6\u00f6tab plokkseadmestikul ja teostab kirjutamise sisendi\/v\u00e4ljundi p\u00e4ringute kr\u00fcpteerimist ning lugemise p\u00e4ringute dekr\u00fcpteerimist, olles sillaks plokkseadmestiku ja failis\u00fcsteemi draiveri vahel. <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog-cloudflare-com-assets.storage.googleapis.com\/2020\/03\/storage-stack.png\"><img decoding=\"async\" alt=\"Ettev\u00f5te Cloudflare on valmistanud parandused, mis kiirendavad oluliselt kettakr\u00fcptimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/85a5ec907119f64eb19edadfc80011a6.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>dm-crypt'i j\u00f5udluse hindamiseks kasutades paketti <noindex><a rel=\"nofollow\" href=\"https:\/\/fio.readthedocs.io\/en\/latest\/fio_doc.html\">Flexible I\/O tester<\/a><\/noindex> tehti testimine kr\u00fcpteeritud ja kr\u00fcpteerimata osade kiirusest RAM-diskil, mis asub RAM-is, et v\u00e4ltida kettaj\u00f5udluse k\u00f5ikumisi ning keskenduda koodi j\u00f5udlusele. Kr\u00fcpteerimata osade lugemise ja kirjutamise j\u00f5udlus p\u00fcsis tasemel 1126 MB\/s, kuid kr\u00fcpteerimise sissel\u00fclitamisel langes kiirus <b>7 korda<\/b> ja oli 147 MB\/s. <\/p>\n<p>Alguses tekkis kahtlus, et tuumas\u00fcsteemi kr\u00fcptos\u00fcsteemis kasutatakse ebaefektiivseid algoritme. Siiski kasutasid testid k\u00f5ige kiiremat aes-xts algoritmi 256-bitise kr\u00fcptimisv\u00f5tmega, mille j\u00f5udlus \"cryptsetup benchmark\" k\u00e4ivitamisel \u00fcletas kahekordselt RAM-diskist saadud tulemuse. Eksperimendid dm-crypt'i j\u00f5udluse tuunimise lippudega ei andnud tulemusi: flagi \"\u2014perf-same_cpu_crypt\" kasutamisel langes j\u00f5udlus isegi 136 MB\/s-ni, samas kui flagi \"\u2014perf-submit_from_crypt_cpus\" m\u00e4\u00e4ramisel t\u00f5usis see vaid 166 MB\/s-ni.<\/p>\n<p>S\u00fcgam anal\u00fc\u00fcs t\u00f6\u00f6loogikast n\u00e4itas, et dm-crypt ei ole nii lihtne, nagu esmapilgul tundub: kui FS draiverilt saabub kirjutamisettepanek, ei t\u00f6\u00f6tle dm-crypt seda kohe, vaid paigutab selle j\u00e4rjekorda \"kcryptd\", mis ei lahenda seda kohe, vaid ainult sobival hetkel. J\u00e4rjekorrast saadetakse k\u00fcsitud andmed Linux Crypto API-sse kr\u00fcptimise teostamiseks. Kuna Crypto API kasutab as\u00fcnkroonset t\u00e4itmismudelit, ei toimu ka kr\u00fcptimine kohe, vaid omakorda teise j\u00e4rjekorra kaudu. P\u00e4rast kr\u00fcptimise l\u00f5petamist v\u00f5ib dm-crypt proovida sortida ootej\u00e4rjekorrast kirjed, kasutades otsingupuu. <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9A%D1%80%D0%B0%D1%81%D0%BD%D0%BE-%D1%87%D1%91%D1%80%D0%BD%D0%BE%D0%B5_%D0%B4%D0%B5%D1%80%D0%B5%D0%B2%D0%BE\">punane-must<\/a><\/noindex>. L\u00f5puks haarab eraldi s\u00fcdamikku voog taas teatud viivitusega kogunenud sisendi\/-v\u00e4ljade p\u00e4ringud ja saadab need blokeeringu seadme staaki.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog-cloudflare-com-assets.storage.googleapis.com\/2020\/03\/dm-crypt.png\"><img decoding=\"async\" alt=\"Ettev\u00f5te Cloudflare on valmistanud parandused, mis kiirendavad oluliselt kettakr\u00fcptimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/2b64e1e781d01d3735c9ba81411ec026.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Lugemise ajal lisab dm-crypt esmalt \"kcryptd_io\" j\u00e4rjekorda p\u00e4ringu andmete saamiseks m\u00e4luseadmest. Teatud aja p\u00e4rast muutuvad andmed k\u00e4ttesaadavaks ja paigutatakse j\u00e4rjekorda \"kcryptd\" dekr\u00fcpteerimiseks.<br \/>\nKcryptd saadab p\u00e4ringu Linux Crypto API-le, mis dekr\u00fcpteerib informatsiooni as\u00fcnkroonselt. P\u00e4ringud ei l\u00e4bida alati k\u00f5iki j\u00e4rjekordi, kuid halvimatel juhtudel v\u00f5ib kirjutamissoov j\u00e4\u00e4da j\u00e4rjekordadesse kuni 4 korda, samas lugemissoov kuni 3 korda. Iga j\u00e4rjekorda sattumine toob kaasa viivitusi, mis on dm-crypti m\u00e4rgatava j\u00f5udluse languse peamine p\u00f5hjus. <\/p>\n<p>Ooten on j\u00e4rjekordade kasutamine tingitud vajadusest t\u00f6\u00f6tada olukordades, kus esinevad katkestused. 2005. aastal, kui rakendati praegune dm-crypt t\u00f6\u00f6mudel j\u00e4rjekordade p\u00f5hjal, ei olnud Crypto API veel as\u00fcnkrooniline. P\u00e4rast Crypto API \u00fcleminekut as\u00fcnkroonilisele t\u00e4itmisre\u017eiimile hakkas kehtima sisuliselt kahekordne kaitse. J\u00e4rjekorrad toodi sisse ka tuuma virna tarbimise s\u00e4\u00e4stmiseks, kuid p\u00e4rast selle suurenemist 2014. aastal kaotasid need optimeerimised oma relevantsuse. Lisaj\u00e4rjekord 'kcryptd_io' loodi, et \u00fcletada kitsaskoht, mis viis m\u00e4ludaotlemise ootamiseni suurte p\u00e4ringute osas. 2015. aastal lisati veel sorteerimisfaas, kuna mitme protsessoriga s\u00fcsteemides kr\u00fcpteerimisperioodid v\u00f5iksid l\u00f5ppeda, j\u00e4rgimata saatmisj\u00e4rjekorda (nagu j\u00e4rjestikune juurdep\u00e4\u00e4s kettale asendati juhusliku juurdep\u00e4\u00e4suga ning CFQ ajakava ei t\u00f6\u00f6tanud efektiivselt). Praegu on SSD-diskide kasutamisel sorteerimine kaotanud m\u00f5tte ning CFQ ajakava ei ole enam tuumas kasutusel.<\/p>\n<p>Arvestades, et t\u00e4nap\u00e4eva m\u00e4luseadmed on muutunud kiiremateks ja nutikamateks, on Linuxi tuuma ressursside jaotuss\u00fcsteem \u00fcle vaadatud ning m\u00f5ned alams\u00fcsteemid on uuesti v\u00e4lja t\u00f6\u00f6tatud, Cloudflare'i insenerid <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/linux\/blob\/master\/patches\/0023-Add-DM_CRYPT_FORCE_INLINE-flag-to-dm-crypt-target.patch\">lisanud<\/a><\/noindex> dm-cryptis on uus t\u00f6\u00f6re\u017eiim, mis on vaba liigsete j\u00e4rjekordade ja as\u00fcnkroonsete k\u00f5nede kasutamisest. Re\u017eiim aktiveeritakse eraldi lipuga 'force_inline' ja viib dm-crypti lihtsa proksi vormi, mis kr\u00fcpteerib ja dekr\u00fcpteerib saabuvad p\u00e4ringud. Koostoime Crypto API-ga on optimeeritud, valides selgelt kr\u00fcpteerimisalgoritmid, mis t\u00f6\u00f6tavad s\u00fcnkroonselt ja ei kasuta p\u00e4ringute j\u00e4rjekordi. S\u00fcnkroonse t\u00f6\u00f6 tegemiseks Crypto API-ga oli <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/linux\/blob\/master\/patches\/0024-Add-xtsproxy-Crypto-API-module.patch\">on pakutud<\/a><\/noindex> moodul, mis v\u00f5imaldab kasutada FPU\/AES-NI kiirusenamuse saavutamiseks ning suunab otse kr\u00fcpteerimis- ja dekr\u00fcpteerimistaotlusi l\u00e4bi.<\/p>\n<p>L\u00f5puks \u00f5nnestus RAM-diskiga testimisel dm-crypti j\u00f5udlust enam kui kahekordselt t\u00f5sta \u2014 j\u00f5udlus suurenes 294 MB\/s (2 x 147 MB\/s) kuni 640 MB\/s, mis on v\u00e4ga l\u00e4hedal puhta kr\u00fcpteerimise j\u00f5udlusele (696 MB\/s).<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog-cloudflare-com-assets.storage.googleapis.com\/2020\/03\/read-throughput-annotated.png\"><img decoding=\"async\" alt=\"Ettev\u00f5te Cloudflare on valmistanud parandused, mis kiirendavad oluliselt kettakr\u00fcptimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/d7f7edcc0251f0fbc0fd3095cce8f8a0.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog-cloudflare-com-assets.storage.googleapis.com\/2020\/03\/write-throughput-annotated.png\"><img decoding=\"async\" alt=\"Ettev\u00f5te Cloudflare on valmistanud parandused, mis kiirendavad oluliselt kettakr\u00fcptimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/2c9fd0549da22ee1987a166604f69c0b.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog-cloudflare-com-assets.storage.googleapis.com\/2020\/03\/await-annotated.png\"><img decoding=\"async\" alt=\"Ettev\u00f5te Cloudflare on valmistanud parandused, mis kiirendavad oluliselt kettakr\u00fcptimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/a0c9d02ef10ad90b2deaeddde0e2434b.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Reaalsetel serveritel koormustestimise k\u00e4igus n\u00e4itas uus teostus tulemuslikkust, mis on v\u00e4ga l\u00e4hedane konfigureerimisele, mis t\u00f6\u00f6tab ilma kr\u00fcpteerimiseta, ja kr\u00fcpteerimise lubamine serverites, kus on Cloudflare'i vahem\u00e4lu, ei m\u00f5jutanud vastamise kiiruset. Edaspidi kavatseb Cloudflare viia ettevalmistatud plaastrid p\u00f5hituuma Linuxi koostisosasse, kuid enne seda tuleb neid t\u00f5hususe t\u00f5stmiseks \u00fcmber teha, kuna need on optimeeritud teatud koormuse jaoks ja ei h\u00f5lma k\u00f5iki kasutusvaldkondi, n\u00e4iteks kr\u00fcpteerimist madala v\u00f5imsusega integreeritud seadmetes.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/blog-cloudflare-com-assets.storage.googleapis.com\/2020\/03\/prod.png\"><img decoding=\"async\" alt=\"Ettev\u00f5te Cloudflare on valmistanud parandused, mis kiirendavad oluliselt kettakr\u00fcptimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/cad243a99fa04bb74f5e6a25ae2e7b3e.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52630\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Cloudflare \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b\u0438 \u043e \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0438 \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0434\u0438\u0441\u043a\u043e\u0432\u043e\u0433\u043e \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u044f\u0434\u0440\u0435 Linux. \u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0431\u044b\u043b\u0438 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u043f\u0430\u0442\u0447\u0438 \u0434\u043b\u044f \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b dm-crypt \u0438 Crypto API, \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0432\u0448\u0438\u0435 \u0432 \u0441\u0438\u043d\u0442\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u0442\u0435\u0441\u0442\u0435 \u0431\u043e\u043b\u0435\u0435 \u0447\u0435\u043c \u0432 \u0434\u0432\u0430 \u0440\u0430\u0437\u0430 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u0443\u044e \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u0438 \u0447\u0442\u0435\u043d\u0438\u0438 \u0438 \u0437\u0430\u043f\u0438\u0441\u0438, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0432 \u0434\u0432\u0430 \u0440\u0430\u0437\u0430 \u0441\u043d\u0438\u0437\u0438\u0442\u044c \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438. \u041f\u0440\u0438 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 \u043d\u0430 \u0440\u0435\u0430\u043b\u044c\u043d\u043e\u043c \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":75940,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-75939","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Cloudflare \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b\u0438 \u043e 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