{"id":105185,"date":"2022-09-27T21:36:41","date_gmt":"2022-09-27T19:36:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd"},"modified":"2022-09-27T21:36:41","modified_gmt":"2022-09-27T19:36:41","slug":"v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","title":{"rendered":"En glemt patch er fundet i Linux-kernen, der p\u00e5virker ydeevnen p\u00e5 AMD CPU'er","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Linux-kernen 6.0, hvis udgivelse forventes p\u00e5 n\u00e6ste mandag, er der foretaget en \u00e6ndring, der l\u00f8ser ydeevneproblemer p\u00e5 systemer med AMD Zen-processorer. Kilden til ydeevnefaldet var kode, der blev tilf\u00f8jet for 20 \u00e5r siden for at omg\u00e5 en hardwarefejl i visse chipsets. Hardwarefejlen er l\u00e6nge blevet udbedret og optr\u00e6der ikke i aktuelle chipsets, men den gamle workaround blev glemt og er blevet kilden til nedsat ydeevne p\u00e5 systemer baseret p\u00e5 moderne AMD CPU'er. Nye systemer med Intel CPU'er p\u00e5virkes ikke af den gamle workaround, da adgangen til ACPI foreg\u00e5r via en separat intel_idle-driver og ikke den generelle processor_idle-driver. <\/p>\n

Workaround'en blev tilf\u00f8jet til kernen i marts 2002 for at blokere manifestation af en fejl i chipsets, der var relateret til manglende korrekt opstilling af idle-tilstande p\u00e5 grund af forsinkelse i behandlingen af STPCLK# signalet. For at omg\u00e5 problemet blev der tilf\u00f8jet en ekstra WAIT-instruktion til ACPI-implementationen, hvilket forsinkede processoren, s\u00e5 chipsettet fik tid til at g\u00e5 ind i idle-tilstand. Ved profiling med hj\u00e6lp af Instruction-Based Sampling (IBS) p\u00e5 AMD Zen3-processorer blev det konstateret, at processoren bruger betydelig tid p\u00e5 at udf\u00f8re ditto, hvilket f\u00f8rer til en forkert fortolkning af belastningsstatus p\u00e5 processoren og til fasts\u00e6ttelse af dybere s\u00f8vn-tilstande (C-State) af cpuidle-behandleren. <\/p>\n

En s\u00e5dan adf\u00e6rd afspejles i nedsat ydeevne ved belastninger, hvor idle- og busy-tilstande skifter hyppigt. For eksempel stiger de gennemsnitlige tbench-resultater fra 32191 MB\/s til 33805 MB\/s ved brug af et patch, der deaktiverer workaround'en.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0431\u044b\u043b \u0437\u0430\u0431\u044b\u0442 \u0438 \u0441\u0442\u0430\u043b […]<\/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-105185","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47En glemt patch er fundet i Linux-kernen, der p\u00e5virker ydeevnen p\u00e5 AMD CPU'er | ProHoster","description":"I Linux-kernen 6.0, hvis udgivelse forventes p\u00e5 n\u00e6ste mandag, er der foretaget en \u00e6ndring, der l\u00f8ser ydeevneproblemer p\u00e5 systemer med AMD 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