{"id":253614,"date":"2017-03-09T08:57:00","date_gmt":"2017-03-09T07:57:00","guid":{"rendered":"https:\/\/cms.galaxiemedia.fr\/tomshardware\/2017\/03\/09\/ryzen-performances-plombees-par-un-bug-dans-windows-10\/"},"modified":"2023-06-26T04:15:56","modified_gmt":"2023-06-26T02:15:56","slug":"ryzen-performances-plombees-par-un-bug-dans-windows-10","status":"publish","type":"post","link":"https:\/\/www.tomshardware.fr\/ryzen-performances-plombees-par-un-bug-dans-windows-10\/","title":{"rendered":"Ryzen : performances plomb\u00e9es par un bug dans Windows 10"},"content":{"rendered":"

\"ImageL’architecture Zen d’AMD<\/span><\/span><\/span><\/span><\/span>Un bug dans Windows 10 emp\u00eacherait le syst\u00e8me de correctement d\u00e9tecter les threads et la m\u00e9moire cache des processeurs Ryzen<\/strong>, selon WCCFTech<\/a>. AMD aurait confirm\u00e9 le probl\u00e8me et annonce travailler avec Microsoft pour le r\u00e9soudre. Curieusement, il n\u2019est pas pr\u00e9sent sur Windows 7. Quoi qu\u2019il en soit, il explique pourquoi d\u00e9sactiver le SMT dans les jeux am\u00e9liore les performances, comme nous le montrons dans nos tests<\/a>.<\/p>\n

\n\n\n
\u00c0 lire aussi :<\/strong>
– Notre comparatif de processeurs<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

Tr\u00e8s mauvaise gestion des ressources<\/h4>\n

Tout comme le HyperThreading d\u2019Intel, le SMT (Simultaneous Multi-Threading) permet \u00e0 un coeur de g\u00e9rer deux threads. Concr\u00e8tement, le premier thread dispose de toute la puissance de calcul, tandis que le second n\u2019a que 20 % \u00e0 30 % des ressources. Le second thread peut ainsi puiser dans les parties du coeur qui ne sont pas utilis\u00e9es par le premier thread afin d\u2019optimiser l\u2019utilisation du coeur entier. L\u2019ordonnanceur de Windows ajuste donc le type de calcul envoy\u00e9 \u00e0 chaque thread pour ne pas surcharger ceux qui ont moins de ressources \u00e0 leur disposition.<\/p>\n

Or, contrairement \u00e0 ce qui se passe avec un processeur Intel, Windows 10 est incapable de distinguer les threads secondaires SMT des threads primaires<\/strong>, et traite par exemple le Ryzen 7 1800X comme un processeur \u00e0 16 coeurs, au lieu de 8 coeurs et 16 threads. De plus, le syst\u00e8me d\u2019exploitation ne reconna\u00eet pas correctement la m\u00e9moire cache, traitant le processeur comme s\u2019il y avait 136 Mo de L2 et L3, au lieu des 20 Mo pr\u00e9sent<\/strong>. Il est donc pr\u00e9f\u00e9rable de d\u00e9sactiver le SMT en attendant le correctif de Microsoft.<\/p>\n","protected":false},"excerpt":{"rendered":"

Et pas de probl\u00e8me sur Windows 7...<\/p>","protected":false},"author":8,"featured_media":253615,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[487,4071,4097],"tags":[551,556,511,555],"hubs":[],"acf":{"post_show_excerpt":true,"post_source":{"title":"WCCFTech","url":"http:\/\/wccftech.com\/amd-ryzen-performance-negatively-affected-windows-10-scheduler-bug\/","target":""}},"yoast_head":"\nRyzen : performances plomb\u00e9es par un bug dans Windows 10<\/title>\n<meta name=\"description\" content=\"Et pas de probl\u00e8me sur Windows 7...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tomshardware.fr\/ryzen-performances-plombees-par-un-bug-dans-windows-10\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta 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