{"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\/novosti-interneta\/kompaniya-cloudflare-podgotovila-patchi-kardinalno-uskoryayushhie-diskovoe-shifrovanie-v-linux","title":{"rendered":"Cloudflare on ette valmistanud pat\u0161e, mis kiirendavad oluliselt ketta \u0161ifreerimist 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\/\">reported<\/a><\/noindex> tegevuse l\u00e4biviimisest Linuxi tuumadeskriipimise j\u00f5udluse optimeerimise alal. Tulemuseks on valmistatud <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/linux\/tree\/master\/patches\">patchid<\/a><\/noindex> alams\u00fcsteemi <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/cryptsetup\/cryptsetup\/-\/wikis\/DMCrypt\">dm-crypt<\/a><\/noindex> ja Crypto API, mis v\u00f5imaldas s\u00fcnteetilises testis rohkem kui kaks korda t\u00f5sta lugemise ja kirjutamise l\u00e4bilaskev\u00f5imet ning samas ka poole v\u00f5rra v\u00e4hendada latentsust. Reaalse riistvara testimisel \u00f5nnestus kr\u00fcptimise \u00fclej\u00e4\u00e4k v\u00e4hendada praktiliselt tasemele, mida t\u00e4heldati andmeid kr\u00fcptimata disks.<\/p>\n<p>Cloudflare kasutab dm-crypt'i andmete kr\u00fcptimiseks, mis on salvestatud meediumidel, mida kasutatakse sisu vahem\u00e4llu salvestamiseks CDN-v\u00f5rgus. Dm-crypt toimib plokkseadmestiku tasemel, tehes kirjutamisse sissetulevate \/ v\u00e4ljaminevate p\u00e4ringute kr\u00fcpteerimist ja lugemisp\u00e4ringute dekr\u00fcpteerimist, olles plekk seadmestiku 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=\"Cloudflare on ette valmistanud pat\u0161e, mis kiirendavad oluliselt ketta \u0161ifreerimist 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> toimus m\u00f5\u00f5tmine kr\u00fcptitud ja kr\u00fcpteerimata osade t\u00f6\u00f6kiirusel RAM-diskil, mis asub RAM-is, et v\u00e4listada diskide j\u00f5udluse k\u00f5ikumised ja keskenduda koodij\u00f5udlusele. Kr\u00fcpteerimata osade lugemise ja kirjutamise j\u00f5udlus p\u00fcsis 1126 MB\/s juures, kuid kr\u00fcpteerimise aktiveerimisel v\u00e4henes kiirus <b>7 korda<\/b> ja oli 147 MB\/s. <\/p>\n<p>Esialgu kahtlustati, et tuumikkr\u00fcptos\u00fcsteemis on kasutatud ebaefektiivseid algoritme. Kuid testides kasutati k\u00f5ige kiiremat algoritmi aes-xts 256-bitise kr\u00fcptimise v\u00f5tmega, mille j\u00f5udlus 'cryptsetup benchmark'i teostamisel oli rohkem kui kaks korda k\u00f5rgem kui RAM-diskis testimisest saadud tulemus. Eksperimendid dm-crypt'i j\u00f5udluse h\u00e4\u00e4lestamise lipukestega ei andnud tulemusi: lipu '\u2014perf-same_cpu_crypt' kasutamisel v\u00e4henes j\u00f5udlus isegi 136 MB\/s-eni, samas kui lipu '\u2014perf-submit_from_crypt_cpus' m\u00e4\u00e4ramine t\u00f5usis vaid 166 MB\/s-eni.<\/p>\n<p>S\u00fcvitsi minek demonstreeris, et dm-crypt ei ole nii lihtne, nagu tundub \u2014 kui failis\u00fcsteemi draiverist tuleb kirjutamissoov, ei t\u00f6\u00f6tle dm-crypt seda koheselt, vaid paneb j\u00e4rjekorda 'kcryptd', mis ei tegele selle t\u00f6\u00f6tlemisega kohe, vaid siis, kui on sobiv hetk. J\u00e4rjekorrast saadetakse p\u00e4ring Linux Crypto API-sse kr\u00fcptimise teostamiseks. Kuid kuna Crypto API kasutab as\u00fcnkroonset t\u00e4itmismudelit, tehakse kr\u00fcpteerimine samuti mitte kohe, vaid vahepealsele j\u00e4rjekorrale. P\u00e4rast kr\u00fcpteerimise l\u00f5ppemist v\u00f5ib dm-crypt proovida ootej\u00e4rjekorras olevate kirjutamisp\u00e4ringute sorteerimist, kasutades otsingupuud <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\">red-black<\/a><\/noindex>. L\u00f5puks haarab tuuma eraldi l\u00f5ng taas teatud viivitusega kogunenud sissetuleku\/v\u00e4ljamineku p\u00e4ringud ja saadab need plokkseadmestiku virna.<\/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=\"Cloudflare on ette valmistanud pat\u0161e, mis kiirendavad oluliselt ketta \u0161ifreerimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/2b64e1e781d01d3735c9ba81411ec026.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Lugemise puhul lisab dm-crypt esmalt j\u00e4rjekorda 'kcryptd_io' p\u00e4ringu andmete t\u00fckist. M\u00f5ne aja p\u00e4rast saavad andmed k\u00e4tte ja l\u00fckatakse 'kcrypt' j\u00e4rjekorda dekr\u00fcpteerimiseks.<br \/>\nKcryptd saadab p\u00e4ringu Linux Crypto API-sse, mis dekr\u00fcpteerib teabe as\u00fcnkroonselt. P\u00e4ringud ei pruugi alati l\u00e4bi k\u00f5igi j\u00e4rjekordade minna, kuid halvimatel juhtudel v\u00f5ib kirjutamisp\u00e4ring j\u00e4\u00e4da j\u00e4rjekordadesse kuni 4 korda, lugemisp\u00e4ring kuni 3 korda. Iga j\u00e4rjekorda sattumine toob kaasa viivitusi, mis on dm-crypt'i j\u00f5udluse m\u00e4rkimisv\u00e4\u00e4rse v\u00e4henemise peamine p\u00f5hjus. <\/p>\n<p>J\u00e4rjekordade kasutamine on tingitud vajadusest t\u00f6\u00f6tada katkestuste tekkimise tingimustes. 2005. aastal, kui rakendati dm-crypti praegust mudelit j\u00e4rjekordade p\u00f5hjal, ei olnud Crypto API veel as\u00fcnkroonne. P\u00e4rast Crypto API \u00fcleminekut as\u00fcnkroonsetele t\u00f6\u00f6mudelitele hakati praktikas rakendama kahekordset kaitset. J\u00e4rjekorrad lisati ka tuuma steki tarbimise s\u00e4\u00e4stmiseks, kuid p\u00e4rast selle suurendamist 2014. aastal kaotasid need optimiseerimised oma t\u00e4htsuse. T\u00e4iendav j\u00e4rjekord 'kcryptd_io' sissetoomine toimus, et \u00fcletada kitsaskoht, mis p\u00f5hjustas m\u00e4lu eraldamise viivitusi palju p\u00e4ringute korral. 2015. aastal lisati ka sorteerimise etapp, kuna kr\u00fcptimisrajatised mitme protsessoriga s\u00fcsteemides said l\u00f5petada mitte s\u00e4ilitades saatmiskorda (kui j\u00e4rkj\u00e4rguline juurdep\u00e4\u00e4s kettale toimus, toimus juurdep\u00e4\u00e4s juhuslikult, samuti ei toiminud CFQ planeerija t\u00f5husalt). T\u00e4nap\u00e4eval SSD-kettaseente kasutamisel on sorteerimise vajadus kadunud ja CFQ planeerijat ei kasutata enam tuumas.<\/p>\n<p>Arvestades, et t\u00e4nap\u00e4evased salvestusseadmed on muutunud kiiremaks ja nutikamaks, on Linuxi tuuma ressursside jaotamise s\u00fcsteem \u00fcle vaadatud ning m\u00f5ned alams\u00fcsteemid on \u00fcmber kujundatud, 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\">lisasid<\/a><\/noindex> dm-cryptis on uus t\u00f6\u00f6re\u017eiim, mis loobub liigsete j\u00e4rjekordade ja as\u00fcnkroonsete k\u00f5nede kasutamisest. Re\u017eiim l\u00fclitatakse sisse eraldi lipuga &#171;force_inline&#187; ning toob dm-crypti lihtsa proxy vormi, mis kr\u00fcpteerib ja dekr\u00fcpteerib saabunud p\u00e4ringud. Suhtlust Crypto API-ga on optimeeritud \u0161ifreerimisalgoritmide otsese valiku abil, mis t\u00f6\u00f6tavad s\u00fcnkroonselt ja ei kasuta p\u00e4ringute j\u00e4rjekordi. S\u00fcnkroonselt Crypto API-ga t\u00f6\u00f6de tegemiseks on <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/linux\/blob\/master\/patches\/0024-Add-xtsproxy-Crypto-API-module.patch\">pakutud<\/a><\/noindex> modul, mis v\u00f5imaldab kasutada FPU\/AES-NI kiirendamiseks ja suunab otse kr\u00fcpteerimise ja dekr\u00fcpteerimise p\u00e4ringud.<\/p>\n<p>L\u00f5pptulemusena \u00f5nnestus RAM-disk testimise k\u00e4igus t\u00f5sta dm-crypti j\u00f5udlust enam kui kaks korda \u2014 j\u00f5udlus t\u00f5usis 294 MB\/s (2 x 147 MB\/s) 640 MB\/s-ni, mis on v\u00e4ga l\u00e4hedane palja 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=\"Cloudflare on ette valmistanud pat\u0161e, mis kiirendavad oluliselt ketta \u0161ifreerimist 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=\"Cloudflare on ette valmistanud pat\u0161e, mis kiirendavad oluliselt ketta \u0161ifreerimist 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=\"Cloudflare on ette valmistanud pat\u0161e, mis kiirendavad oluliselt ketta \u0161ifreerimist Linuxis.\" src=\"\/wp-content\/uploads\/2020\/03\/a0c9d02ef10ad90b2deaeddde0e2434b.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Reaalsetes serverites testides n\u00e4itas uus rakendus j\u00f5udlust, mis on v\u00e4ga l\u00e4hedane konfigureerimisele, mis t\u00f6\u00f6tab ilma kr\u00fcpteerimiseta, ja kr\u00fcpteerimise sissel\u00fclitamine Cloudflare'i vahem\u00e4lu serverites ei m\u00f5jutanud vastamisaega. Tulevikus plaanib Cloudflare edastada ette valmistatud plaastrid Linuxi peakoondisse, kuid enne seda tuleb neid \u00fcmber t\u00f6\u00f6tada, kuna need on optimeeritud konkreetsete koormuste jaoks ega katab kogu kasutusvaldkondi, n\u00e4iteks kr\u00fcpteerimist v\u00e4hese 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=\"Cloudflare on ette valmistanud pat\u0161e, mis kiirendavad oluliselt ketta \u0161ifreerimist 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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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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