{"id":35395,"date":"2019-10-31T22:04:04","date_gmt":"2019-10-31T19:04:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-operatsionnoj-sistemy-dragonfly-bsd-5-6\/"},"modified":"2019-10-31T22:04:04","modified_gmt":"2019-10-31T19:04:04","slug":"reliz-operatsionnoj-sistemy-dragonfly-bsd-5-6","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/reliz-operatsionnoj-sistemy-dragonfly-bsd-5-6","title":{"rendered":"Lan\u00e7amento do sistema operacional DragonFly BSD 5.6","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"http:\/\/www.dragonflybsd.org\/release56\/\">Dispon\u00edvel<\/a><\/noindex>  lan\u00e7amento <noindex><a rel=\"nofollow\" href=\"http:\/\/www.dragonflybsd.org\/\">DragonFlyBSD 5.6<\/a><\/noindex>, um sistema operacional com um n\u00facleo h\u00edbrido, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=2717\">criado<\/a><\/noindex> em 2003 com o objetivo de um desenvolvimento alternativo da linha FreeBSD 4.x. Entre as caracter\u00edsticas do DragonFly BSD, destaca-se o sistema de arquivos de vers\u00e3o distribu\u00edda <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.opennet.ru\/HAMMER\">HAMMER<\/a><\/noindex>, suporte para carregamento de n\u00facleos \u00abvirtuais\u00bb do sistema como processos de usu\u00e1rio, capacidade de caching de dados e metadados do FS em SSDs, considerando o contexto de links simb\u00f3licos variantes, possibilidade de congelar processos mantendo seu estado no disco, n\u00facleo h\u00edbrido utilizando threads leves (LWKT). <\/p>\n<p>Principais <noindex><a rel=\"nofollow\" href=\"http:\/\/www.dragonflybsd.org\/release56\/\">s\u00e3o<\/a><\/noindex>, adicionadas no DragonFlyBSD 5.6:\n<\/p>\n<ul>\n<li class=\"l\"> Foi realizada uma moderniza\u00e7\u00e3o no sistema de gerenciamento de mem\u00f3ria virtual. Muitas subsistemas relacionados \u00e0 mem\u00f3ria virtual e PMAP foram reescritos.<br \/>\nEm muitos locais, o c\u00f3digo foi liberado de bloqueios, incluindo nas fun\u00e7\u00f5es m_page_wakeup, vm_hold e vm_unhold. A efici\u00eancia da utiliza\u00e7\u00e3o do cache do processador foi aumentada pela redu\u00e7\u00e3o da migra\u00e7\u00e3o de objetos de VM entre os n\u00facleos de CPU e pela diminui\u00e7\u00e3o da sobrecarga ao lidar com exce\u00e7\u00f5es (page-fault) para \u00e1reas de mem\u00f3ria compartilhadas. O algoritmo de aloca\u00e7\u00e3o de p\u00e1ginas de mem\u00f3ria foi melhorado. As lat\u00eancias na execu\u00e7\u00e3o da fun\u00e7\u00e3o vm_page_alloc() foram eliminadas. Um API vm_page_hash*() foi adicionado, permitindo realizar sele\u00e7\u00f5es sem bloqueios.<\/p>\n<p>Como resultado, foi poss\u00edvel <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.dragonflybsd.org\/pipermail\/users\/2019-June\/358196.html\">aumentar significativamente a performance<\/a><\/noindex>. Por exemplo,<br \/>\nno teste buildkernel, o tempo de execu\u00e7\u00e3o das opera\u00e7\u00f5es do lado do n\u00facleo foi reduzido em 40%. A largura de banda aumentou em 7% ao usar CPUs da fam\u00edlia Haswell e em 14% para Xeon. No teste SELF-EXEC S\/DI, em compara\u00e7\u00e3o com a vers\u00e3o anterior, observou-se um aumento de desempenho de 23% para Haswell e 18% para Xeon. No teste<br \/>\nSELF-EXEC S\/SH com 28% e 71%, em SELF-EXEC D\/DI \u2014 23% e 242% (devido \u00e0 melhoria do desempenho de m\u00faltiplas threads), em SELF-EXEC D\/SH com 24% e 234%, em FAULTZF com 17% e 14%, em DOCOMP com 22% e 42%,<br \/>\nem NATIVEKERNEL, 5.1% e 8.1%;<\/p>\n<li class=\"l\"> O driver DRM e o gerenciador de controle de mem\u00f3ria de v\u00eddeo TTM para placas gr\u00e1ficas AMD foram significativamente atualizados. Adicionado suporte para novos APU Ryzen. Melhorado o suporte ao framebuffer UEFI. No radeon\/ttm, foi eliminada uma interbloqueio que afetava negativamente o desempenho. Refatorado o tempo de atraso no processo de inicializa\u00e7\u00e3o para evitar conflitos entre o driver i915 e o servidor X. Chamadas DRM_IOCTL_GET_PCIINFO foram adicionadas para melhorar o suporte a mesa\/libdrm. Muitos erros e defici\u00eancias foram eliminados;\n<li class=\"l\"> O c\u00f3digo de sincroniza\u00e7\u00e3o no sistema de arquivos HAMMER2 foi reescrito, o que permitiu um aumento significativo na performance deste sistema de arquivos. Tamb\u00e9m foi melhorada a performance das opera\u00e7\u00f5es de grava\u00e7\u00e3o sequencial.<br \/>\nPara aumentar a resist\u00eancia a falhas, foi adicionada a rastreabilidade de depend\u00eancias para evitar a divis\u00e3o de diret\u00f3rios\/arquivos durante as opera\u00e7\u00f5es de cria\u00e7\u00e3o, renomea\u00e7\u00e3o ou exclus\u00e3o. O c\u00f3digo de trabalho com snapshots foi reestruturado para reduzir lat\u00eancias e garantir a consist\u00eancia do snapshot. A manipula\u00e7\u00e3o de opera\u00e7\u00f5es simult\u00e2neas de grava\u00e7\u00e3o e descarregamento de cache para o disco (flush) foi aprimorada. A implementa\u00e7\u00e3o da opera\u00e7\u00e3o umount foi melhorada. Aumentou a informatiza\u00e7\u00e3o das mensagens de viola\u00e7\u00e3o de integridade (erro de CRC).<\/p>\n<p>O HAMMER2 \u00e9 recomendado como sistema de arquivos root padr\u00e3o. O suporte \u00e0 clusteriza\u00e7\u00e3o ainda n\u00e3o est\u00e1 dispon\u00edvel. O sistema de arquivos HAMMER2 se distingue por recursos como montagem separada de snapshots, snapshots dispon\u00edveis para grava\u00e7\u00e3o, quotas de diret\u00f3rio, espelhamento incremental, suporte a v\u00e1rios algoritmos de compress\u00e3o, espelhamento multi-master com distribui\u00e7\u00e3o de dados em v\u00e1rios hosts; <\/p>\n<li class=\"l\"> Foi adicionada a suporte inicial para o subsistema FUSE, permitindo a cria\u00e7\u00e3o de sistemas de arquivos no espa\u00e7o do usu\u00e1rio;\n<li class=\"l\"> A performance do filtro de pacotes PF em sistemas multi-core foi aumentada;\n<li class=\"l\"> Foi implementado suporte para os mecanismos de prote\u00e7\u00e3o SMAP (Supervisor Mode Access Prevention) e SMEP (Supervisor Mode Execution Prevention), caso sejam suportados pela CPU. O SMAP permite bloquear o acesso a dados no espa\u00e7o do usu\u00e1rio a partir de c\u00f3digo privilegiado executado no n\u00edvel do n\u00facleo. O SMEP impede a transi\u00e7\u00e3o do modo n\u00facleo para a execu\u00e7\u00e3o de c\u00f3digo que est\u00e1 no n\u00edvel do usu\u00e1rio, o que ajuda a bloquear a explora\u00e7\u00e3o de muitas vulnerabilidades no n\u00facleo (o c\u00f3digo shell n\u00e3o ser\u00e1 executado, pois est\u00e1 no espa\u00e7o do usu\u00e1rio);\n<li class=\"l\"> Foi adicionado c\u00f3digo para bloqueio  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50684\">ataques<\/a><\/noindex> classe MDS (Microarchitectural Data Sampling) nos processadores Intel. \u00c9 necess\u00e1rio ter um microc\u00f3digo atualizado. Por padr\u00e3o, a prote\u00e7\u00e3o est\u00e1 desativada e pode ser ativada atrav\u00e9s de 'sysctl machdep.mds_mitigation=MD_CLEAR'. A ativa\u00e7\u00e3o causa um atraso adicional de cerca de 250ns ao alternar entre o espa\u00e7o do usu\u00e1rio e o n\u00facleo;\n<li class=\"l\"> O n\u00facleo \u00e9 compilado por padr\u00e3o com prote\u00e7\u00e3o retpoline contra ataques Spectre.\n<li class=\"l\"> Muitos utilit\u00e1rios do sistema b\u00e1sico foram traduzidos para usar o LibreSSL;\n<li class=\"l\"> As vers\u00f5es de componentes de terceiros foram atualizadas, incluindo xz 5.2.4,<br \/>\n    libarchive 3.3.3, libressl 2.9.1, openssh 8.0, ldns 1.7.0,<br \/>\nlibedit 2019-03-24. Do FreeBSD foram transferidos evdev, makefs, ministat, libfetch,<br \/>\ndd. Do OpenBSD foram transferidas chamadas libc reallocarray(), timing_safe*(), freezero(), dup3(), recallocarray(), aligned_alloc(), explicit_bzero(). O compilador gcc-8 \u00e9 usado por padr\u00e3o para a constru\u00e7\u00e3o em vez do gcc-5.<\/p>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50887\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 DragonFlyBSD 5.6, \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0441 \u0433\u0438\u0431\u0440\u0438\u0434\u043d\u044b\u043c \u044f\u0434\u0440\u043e\u043c, \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u043e\u0439 \u0432 2003 \u0433\u043e\u0434\u0443 \u0441 \u0446\u0435\u043b\u044c\u044e \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u044f \u0432\u0435\u0442\u043a\u0438 FreeBSD 4.x. \u0418\u0437 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0435\u0439 DragonFly BSD \u043c\u043e\u0436\u043d\u043e \u0432\u044b\u0434\u0435\u043b\u0438\u0442\u044c \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u043e\u043d\u043d\u0443\u044e \u0444\u0430\u0439\u043b\u043e\u0432\u0443\u044e \u0441\u0438\u0441\u0442\u0435\u043c\u0443 HAMMER, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 &#171;\u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445&#187; \u044f\u0434\u0435\u0440 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043a\u0430\u043a \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u043c\u0435\u0442\u0430-\u0434\u0430\u043d\u043d\u044b\u0445 \u0424\u0421 \u043d\u0430 SSD-\u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u0445, \u0443\u0447\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0438\u0435 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043d\u044b\u0435 \u0441\u0438\u043c\u0432\u043e\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0441\u0441\u044b\u043b\u043a\u0438, \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0437\u0430\u043c\u043e\u0440\u043e\u0437\u043a\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 [&hellip;]<\/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-35395","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 DragonFlyBSD 5.6, \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/pt\/blog\/news\/reliz-operatsionnoj-sistemy-dragonfly-bsd-5-6\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" 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