{"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\/it\/blog\/novosti-interneta\/reliz-operatsionnoj-sistemy-dragonfly-bsd-5-6","title":{"rendered":"Rilascio del sistema operativo DragonFly BSD 5.6","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"http:\/\/www.dragonflybsd.org\/release56\/\">Disponibile<\/a><\/noindex>  rilascio <noindex><a rel=\"nofollow\" href=\"http:\/\/www.dragonflybsd.org\/\">DragonFlyBSD 5.6<\/a><\/noindex>, un sistema operativo con kernel ibrido, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=2717\">creato<\/a><\/noindex> nel 2003 con l'obiettivo di sviluppare un'alternativa alla serie FreeBSD 4.x. Tra le caratteristiche di DragonFly BSD si possono evidenziare un file system versione distribuita <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.opennet.ru\/HAMMER\">HAMMER<\/a><\/noindex>, supporto per il caricamento di nuclei &#171;virtuali&#187; del sistema come processi utente, possibilit\u00e0 di caching dei dati e dei metadati del file system su unit\u00e0 SSD, che considerano i collegamenti simbolici varianti contestuali, possibilit\u00e0 di congelare i processi mantenendo il loro stato su disco, n\u00facleo ibrido che utilizza thread leggeri (LWKT). <\/p>\n<p>Principali <noindex><a rel=\"nofollow\" href=\"http:\/\/www.dragonflybsd.org\/release56\/\">miglioramenti<\/a><\/noindex>, aggiunti in DragonFlyBSD 5.6:\n<\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata effettuata un'aggiornamento del sistema di gestione della memoria virtuale. Molti sottosistemi legati alla memoria virtuale e al PMAP sono stati riscritti.<br \/>\nIn molte aree del codice sono state rimosse le sezioni critiche, comprese le funzioni m_page_wakeup, vm_hold e vm_unhold. \u00c8 stata migliorata l'efficienza dell'uso della cache del processore riducendo la migrazione degli oggetti VM tra i core CPU e diminuendo i costi associati alla gestione delle eccezioni (page-fault) per le aree di memoria condivise. \u00c8 stato migliorato l'algoritmo di allocazione delle pagine di memoria. Sono stati eliminati i ritardi nel funzionamento della funzione vm_page_alloc(). \u00c8 stata aggiunta l'API vm_page_hash*(), che consente di eseguire interrogazioni senza blocchi.<\/p>\n<p>Di conseguenza, siamo riusciti a <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.dragonflybsd.org\/pipermail\/users\/2019-June\/358196.html\">migliorare le prestazioni<\/a><\/noindex>. Ad esempio,<br \/>\nnel test buildkernel, il tempo di esecuzione delle operazioni nel kernel \u00e8 stato ridotto del 40%. La capacit\u00e0 di elaborazione \u00e8 aumentata del 7% con la CPU della serie Haswell e del 14% per Xeon. Nel test SELF-EXEC S\/DI rispetto alla versione precedente, si \u00e8 notato un incremento delle prestazioni del 23% per Haswell e del 18% per Xeon. Nel test<br \/>\nSELF-EXEC S\/SH rispettivamente 28% e 71%, in SELF-EXEC D\/DI \u2014 23% e 242% (grazie al miglioramento delle prestazioni del multithreading), in SELF-EXEC D\/SH su 24% e 234%, in FAULTZF su 17% e 14%, in DOCOMP su 22% e 42%,<br \/>\nin NATIVEKERNEL al 5,1% e 8,1%;<\/p>\n<li class=\"l\"> Driver DRM e gestore della memoria video TTM per schede grafiche AMD notevolmente aggiornati. Aggiunta la supporto per i nuovi APU Ryzen. Migliorato il supporto del framebuffer UEFI. In radeon\/ttm \u00e8 stata risolta una deadlock che influiva negativamente sulle prestazioni. \u00c8 stata effettuata una rifattorizzazione nell'assegnazione dei ritardi durante il caricamento per evitare conflitti tra il driver i915 e il server X. Aggiunto il richiamo di DRM_IOCTL_GET_PCIINFO per migliorare il supporto di mesa\/libdrm. Risolti numerosi errori e problemi;\n<li class=\"l\"> Riscritto il codice di sincronizzazione nel file system HAMMER2, il che ha consentito di migliorare significativamente le prestazioni di questo FS. \u00c8 stata inoltre aumentata l'efficienza delle operazioni di scrittura sequenziale.<br \/>\nPer aumentare la resilienza ai crash, \u00e8 stato aggiunto il tracciamento delle dipendenze per escludere la divisione di directory\/file durante le operazioni di creazione, rinominazione o eliminazione. Il codice per la gestione degli snapshot \u00e8 stato rielaborato per ridurre i ritardi e garantire la coerenza dello snapshot. \u00c8 stata migliorata la gestione delle operazioni di scrittura simultanee e dello svuotamento della cache su disco (flush). \u00c8 stata migliorata l'implementazione dell'operazione umount. Maggiore informativit\u00e0 nei messaggi di errore di integrit\u00e0 (CRC error).<\/p>\n<p>HAMMER2 \u00e8 raccomandato come file system radice predefinito. Il supporto per la clustering non \u00e8 ancora disponibile. Il file system HAMMER2 \u00e8 caratterizzato da funzionalit\u00e0 come il montaggio separato degli snapshot, snapshot scrivibili, quote a livello di directory, mirroring incrementale, supporto per diversi algoritmi di compressione dei dati, mirroring multi-master con distribuzione dei dati su pi\u00f9 host. <\/p>\n<li class=\"l\"> \u00c8 stato aggiunto il supporto iniziale per il sottosistema FUSE per creare file system nello spazio utente.\n<li class=\"l\"> Migliorata la performance del filtro pacchetti PF su sistemi multicore.\n<li class=\"l\"> \u00c8 stata implementata la supporto per i meccanismi di protezione SMAP (Supervisor Mode Access Prevention) e SMEP (Supervisor Mode Execution Prevention) quando supportati dalla CPU. SMAP consente di bloccare l'accesso ai dati nello spazio utente dal codice privilegiato eseguito a livello di kernel. SMEP impedisce il passaggio dal kernel all'esecuzione di codice a livello utente, bloccando cos\u00ec molte vulnerabilit\u00e0 nel kernel (il shellcode non verr\u00e0 eseguito poich\u00e9 si trova nello spazio utente);\n<li class=\"l\"> Aggiunto codice per bloccare  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50684\">attacchi<\/a><\/noindex> classe MDS (Microarchitectural Data Sampling) nei processori Intel. Per il funzionamento \u00e8 necessario un microcodice aggiornato. Di default la protezione \u00e8 disattivata e si attiva tramite 'sysctl machdep.mds_mitigation=MD_CLEAR'. Attivarla comporta un ritardo aggiuntivo di 250ns durante il passaggio di contesto tra lo spazio utente e il kernel;\n<li class=\"l\"> Il kernel \u00e8 compilato per impostazione predefinita con la protezione retpoline contro gli attacchi Spectre.\n<li class=\"l\"> Molti strumenti del sistema di base sono stati convertiti per utilizzare LibreSSL;\n<li class=\"l\"> Le versioni dei componenti di terze parti sono state aggiornate, inclusi 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. Sono stati trasferiti da FreeBSD evdev, makefs, ministat, libfetch,<br \/>\ndd. Da OpenBSD sono stati trasferiti nelle libc le chiamate a reallocarray(), timing_safe*(), freezero(), dup3(), recallocarray(), aligned_alloc(), explicit_bzero(). Per impostazione predefinita, il compilatore utilizzato per la build \u00e8 gcc-8 invece di 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; 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