ryzen在win7上跑更快(轉自reddit) - 3C

在此Reddit回文中往下找找到原Po的解釋:
原因是Windows 7處理Ryzen SMT的執行緒才是對的
Win 10分不出Ryzen哪個是實體核心還是SMT,
就把兩個執行緒在低執行緒負載時推給一個核心

而且Windows 10有沒有把執行緒像群組指定般處理,
移動那些緒到其他的群組核心, 把快取給浪費掉了

故AMD說他們在微軟一塊寫Win 10的更新檔
所以現在Win 10用Ryzen要得關掉SMT


AMD said they are working with MS for a Win 10 update, but it's clear,
Ryzen with SMT off is faster than on in Win 10.

But Win 7 with SMT on is faster still. O_o

Win 7's scheduler actually handles Ryzen SMT threads correctly,
and this relates to Win 10 not knowing which Ryzen thread are physical or SMT,
shoving 2 threads into 1 core when under low thread workloads...

Also potential issues with Windows 10 not treating the threads as CCX
specific, moving them to the other CCX cores, trashing the cache. :/

This is a pretty serious perf hit,
these issues should have been fixed for launch. -_-



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銀時: 什麼嘛...這不是新阿姆斯特朗旋風噴射阿姆斯特朗砲嗎?做得挺像的呢.
長谷川: 它是能把台北府炸掉,逼迫苛P開城的批踢踢的決戰武器.
新八: 什麼？我們天龍是被這種噁心的大砲打敗的嗎？

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