微軟公佈CPU漏洞修復性能結論:4代Core+W - 3C
By Skylar DavisLinda
at 2018-01-10T10:49
at 2018-01-10T10:49
Table of Contents
微軟公佈CPU漏洞修復性能結論:4代酷睿+Win7受傷最深
http://news.mydrivers.com/1/562/562537.htm
普通的Windows電腦在打上微軟修補Meltdown和Spectre漏洞的補丁後,到底性能會下降嗎
?
民間測試結論各異,其中還不乏聳人聽聞的“標題黨”,對此,微軟終於官方發聲。
微軟Windows和設備執行副總裁TERRY MYERSON今天在微軟官方博客撰文,希望外界可以更
好地理解修復和性能之間的關係。
https://goo.gl/p1PVe2
關於漏洞的說明,微軟的整理是目前最為詳細的——
其中第一種形式(Variant 1,簡稱V1)“Bounds Check Bypass(繞過邊界檢查/邊界檢
查旁路)”和第二種形式“Branch Target Injection(分支目標註入)”屬於Spectre(
幽靈),而第三種“Rogue Data Cache Load(惡意的數據緩存載入)”則屬於Meldown(
熔斷)。
其中,V1和V3均不需要處理器微代碼更新(即BIOS更新),V2則需要。
對於V1,Windows的解決方式是二級制編譯器更新和從JS端加固瀏覽器,對於V2,微軟需
要CPU指令集更新,對於V3,需要分離內核和用戶層代碼的頁表。
性能影響
Myerson稱,微軟發現,修復V1/V3對性能的影響微乎其微,問題的關鍵在於V2對底層指令
集做了修改,導致成為性能損失的主因,以下是微軟的測試結論——
1、搭載Skylake/Kaby Lake或者更新的處理器平台的Windows 10系統,降幅在個位數,意
味著,絕大多數用戶都感受不到變化,因為即便慢,也是在毫秒之內。
2、搭載Haswell或者更早的處理器的Windows 10平台,影響已經有些顯著了,可能部分用
戶已經可以覺察出來。
3、搭載Haswell或者更早的處理器的Windows 7/8.1平台,大部分用戶會明顯感受到性能
削弱。
4、任何處理器的Windows Server平台,尤其是密集I/O環境下,在執行代碼分離操作時性
能降幅會異常明顯。
微軟稱,Windows 7/8在架構時由於使用了過多的用戶到內核過渡,導致影響更明顯。
微軟最後表示,會繼續和合作夥伴一道致力於更優質的安全方案開發。
PS:結合AMD的聲明,他們的CPU架構對Meldown也就是V3是完全免疫,但Spectre的第一種
形式則需要配合操作系統更新實現。
--
微軟:總之快給我更新Win10
--
http://news.mydrivers.com/1/562/562537.htm
普通的Windows電腦在打上微軟修補Meltdown和Spectre漏洞的補丁後,到底性能會下降嗎
?
民間測試結論各異,其中還不乏聳人聽聞的“標題黨”,對此,微軟終於官方發聲。
微軟Windows和設備執行副總裁TERRY MYERSON今天在微軟官方博客撰文,希望外界可以更
好地理解修復和性能之間的關係。
https://goo.gl/p1PVe2
關於漏洞的說明,微軟的整理是目前最為詳細的——
其中第一種形式(Variant 1,簡稱V1)“Bounds Check Bypass(繞過邊界檢查/邊界檢
查旁路)”和第二種形式“Branch Target Injection(分支目標註入)”屬於Spectre(
幽靈),而第三種“Rogue Data Cache Load(惡意的數據緩存載入)”則屬於Meldown(
熔斷)。
其中,V1和V3均不需要處理器微代碼更新(即BIOS更新),V2則需要。
對於V1,Windows的解決方式是二級制編譯器更新和從JS端加固瀏覽器,對於V2,微軟需
要CPU指令集更新,對於V3,需要分離內核和用戶層代碼的頁表。
性能影響
Myerson稱,微軟發現,修復V1/V3對性能的影響微乎其微,問題的關鍵在於V2對底層指令
集做了修改,導致成為性能損失的主因,以下是微軟的測試結論——
1、搭載Skylake/Kaby Lake或者更新的處理器平台的Windows 10系統,降幅在個位數,意
味著,絕大多數用戶都感受不到變化,因為即便慢,也是在毫秒之內。
2、搭載Haswell或者更早的處理器的Windows 10平台,影響已經有些顯著了,可能部分用
戶已經可以覺察出來。
3、搭載Haswell或者更早的處理器的Windows 7/8.1平台,大部分用戶會明顯感受到性能
削弱。
4、任何處理器的Windows Server平台,尤其是密集I/O環境下,在執行代碼分離操作時性
能降幅會異常明顯。
微軟稱,Windows 7/8在架構時由於使用了過多的用戶到內核過渡,導致影響更明顯。
微軟最後表示,會繼續和合作夥伴一道致力於更優質的安全方案開發。
PS:結合AMD的聲明,他們的CPU架構對Meldown也就是V3是完全免疫,但Spectre的第一種
形式則需要配合操作系統更新實現。
--
微軟:總之快給我更新Win10
--
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