Ein Ingenieur von VMware hat die Entwicklergemeinschaft des Linux-Kernels auf einen dramatischen Leistungsverlust bei Verwendung des Linux-Kernels 5.19 hingewiesen. Tests einer virtuellen Maschine mit Kernel 5.19 in einer VMware ESXi-Hypervisor-Umgebung zeigten einen R\u00fcckgang der Rechenleistung um 70%, der Netzwerkoperationen um 30% und der Speichervorg\u00e4nge um 13% im Vergleich zu derselben Konfiguration mit Kernel 5.18. <\/p>\n
Als Ursache f\u00fcr den Leistungsverlust wird eine \u00c4nderung im Code zum Schutz vor Spectre v2-Angriffen (spectre_v2=ibrs) genannt, die auf erweiterten IBRS-Anweisungen (Enhanced Indirect Branch Restricted Speculation) basiert. Diese erm\u00f6glichen ein adaptives Zulassen oder Verhindern von spekulativer Ausf\u00fchrung von Anweisungen w\u00e4hrend der Verarbeitung von Interrupts, Systemaufrufen und Kontextwechseln. Der Schutz wurde implementiert, um die k\u00fcrzlich entdeckte Retbleed-Schwachstelle im Mechanismus der spekulativen Ausf\u00fchrung indirekter Spr\u00fcnge der CPU zu blockieren, die es Angreifern erm\u00f6glicht, Informationen aus dem Kernel-Speicher zu extrahieren oder einen Angriff auf das Host-System durchzuf\u00fchren. virtuellen Maschinen<\/a>. Nach Deaktivierung des Schutzes (spectre_v2=off) kehrt die Leistung auf das vorherige Niveau zur\u00fcck. \u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 VMware \u043e\u0431\u0440\u0430\u0442\u0438\u043b \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u044f\u0434\u0440\u0430 Linux \u043d\u0430 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u044f\u0434\u0440\u0430 Linux 5.19. \u0422\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u044b \u0441 \u044f\u0434\u0440\u043e\u043c 5.19 \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 VMware ESXi \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u043e \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439 \u043d\u0430 70%, \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u043d\u0430 30% \u0438 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0439 \u0441 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435\u043c \u043d\u0430 13%, \u043f\u043e \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044e \u0441 \u0442\u043e\u0439 \u0436\u0435 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 \u044f\u0434\u0440\u0430 […]<\/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-105072","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47 Deutlicher Leistungsabfall des Kernels 5.19, verursacht durch den Schutz gegen Retbleed-Angriffe | ProHoster","description":"Ein Ingenieur von VMware hat die Linux-Kernel-Entwicklergemeinschaft auf einen signifikanten Leistungsabfall bei Verwendung des Kernels Linux 5.19 hingewiesen. Tests einer virtuellen Maschine mit Kernel 5.19 in einer VMware ESXi-Hypervisor-Umgebung zeigten einen R\u00fcckgang der Rechenleistung um 70%, der Netzwerkoperationen um 30% und der Speicheraktionen um 13% im Vergleich zur gleichen Konfiguration auf Basis des Kernels.","canonical_url":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"de_DE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0421\u0435\u0440\u044c\u0451\u0437\u043d\u043e\u0435 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Quelle: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"