{"id":105072,"date":"2022-09-12T15:37:54","date_gmt":"2022-09-12T13:37:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed"},"modified":"2022-09-12T15:37:54","modified_gmt":"2022-09-12T13:37:54","slug":"seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","title":{"rendered":"Erhebliche Leistungsverminderung des Kernels 5.19, verursacht durch den Schutz gegen den Retbleed-Angriff","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ein Ingenieur von VMware hat die Linux-Kernel-Entwicklergemeinschaft auf eine signifikante Leistungsverminderung bei Verwendung des Linux-Kernels 5.19 hingewiesen. Tests einer virtuellen Maschine mit Kernel 5.19 in der VMware ESXi-Hypervisor-Umgebung zeigten eine Reduzierung der Rechenleistung um 70 %, der Netzwerkoperationen um 30 % und der Speicheroperationen um 13 % im Vergleich zur gleichen Konfiguration basierend auf Kernel 5.18. <\/p>\n

Als Grund f\u00fcr die Leistungsverschlechterung wird eine \u00c4nderung im Code des Schutzes gegen Spectre v2-Angriffe (spectre_v2=ibrs) genannt, der auf erweiterten IBRS-Instruktionen (Enhanced Indirect Branch Restricted Speculation) basiert. Diese erm\u00f6glichen es, spekulatives Ausf\u00fchren von Instruktionen w\u00e4hrend der Bearbeitung von Interrupts, Systemaufrufen und Kontextwechseln adaptiv zu erlauben oder zu verbieten. Der Schutz wird aktiviert, um die k\u00fcrzlich entdeckte Schwachstelle Retbleed im Mechanismus des spekulativen Ausf\u00fchrens indirekter CPU-\u00dcberspr\u00fcnge zu blockieren, die es erm\u00f6glicht, Informationen aus dem Kernelspeicher zu extrahieren oder einen Angriff auf das Hosts-System einzuleiten. virtuelle Maschinen<\/a>. Nach Deaktivierung des Schutzes (spectre_v2=off) kehrt die Leistung auf das vorherige Niveau zur\u00fcck.
\n
Quelle: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-news"],"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\udd47Erhebliche Leistungsverminderung des Kernels 5.19, verursacht durch den Schutz gegen den Retbleed-Angriff | ProHoster","description":"Ein Ingenieur von VMware hat die Linux-Kernel-Entwicklergemeinschaft auf eine signifikante Leistungsverminderung bei Verwendung des Linux-Kernels 5.19 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