Re: [情報] Linux4.20針對Meltdown/Spectre/..修正
其實Linus Torvalds有表態
https://lkml.org/lkml/2018/11/19/37
STIBP by default.. Revert?
This was marked for stable, and honestly, nowhere in the discussion did I see an
y mention of just *how* bad the performance impact of this was.
When performance goes down by 50% on some loads, people need to start asking the
mselves whether it was worth it.
It's apparently better to just disable SMT entirely, which is what security-cons
cious people do anyway.
So why do that STIBP slow-down by default when the people who *really* care alre
ady disabled SMT?
I think we should use the same logic as for L1TF: we default to something that d
oesn't kill performance.
Warn once about it, and let the crazy people say "I'd rather take a 50% performa
nce hit than worry about a theoretical issue".
Linus
------------------------------------------------------------------
...關掉或本來就沒HT
就沒這次安全問題的煩惱了吧(眼神死
STIBP也不是核心4.20之後才會加入
目前維護中的核心
4.19.2
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2
4.18.19
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19
4.14.81
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.81
4.9.137
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.137
皆已獲得STIBP新功能...
--
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目前這個功能主要影響Intel的HT...
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Intel的HT這樣一弄根本是半殘了
只能希望AMD那邊別也出包...
※ 編輯: SPDY (220.134.40.176), 11/21/2018 16:33:40
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