中國網友的 3900X 詳細測試 - 3C
By Hedwig
at 2019-07-09T13:08
at 2019-07-09T13:08
Table of Contents
chiphell好讀版
https://www.chiphell.com/thread-2013198-1-1.html
原站:
https://bit.ly/2G1zDFO
節錄文章,關於 CCX 和 CCD的延遲:
https://www.lambda-delta.com/2019/07/05/3900x-review/3/
Zen2的 CCX內的核心之間延遲基本穩定在31ns,考慮到3900x的頻率更高,這個結果也能
理解。而不同CCX的核心之間延遲則大幅度下降了近40%,範圍在76到80ns,可以確定CCX
之間的Data fabric有了重大改進。再看看我最關心的CCD之間的延遲,竟然只有78-80ns
,和CCX之間的延遲幾乎相當,非常的難以置信,我完全想不到AMD是怎麼做到,難道因為
CPU die之間還有直接的互聯?
總結
對Zen2評價,我想說的就是強,相對於Zen1來說,基本是360度全方位的大幅提升。而且
CCD間的低延遲設計,如果應用來未來的Threadripper上,可以規避掉它本來的弱點,不
再需要進行特別的NUMA優化了,所以不止Ryzen3000,對於未來的Threadripper,我都非
常看好。
=====
還自行寫程式測試,並且比對 skylake 架構
蠻有趣的文章,分享
最後延遲真的是假問題 不管IOH還是CCD
--
https://www.chiphell.com/thread-2013198-1-1.html
原站:
https://bit.ly/2G1zDFO
節錄文章,關於 CCX 和 CCD的延遲:
https://www.lambda-delta.com/2019/07/05/3900x-review/3/
Zen2的 CCX內的核心之間延遲基本穩定在31ns,考慮到3900x的頻率更高,這個結果也能
理解。而不同CCX的核心之間延遲則大幅度下降了近40%,範圍在76到80ns,可以確定CCX
之間的Data fabric有了重大改進。再看看我最關心的CCD之間的延遲,竟然只有78-80ns
,和CCX之間的延遲幾乎相當,非常的難以置信,我完全想不到AMD是怎麼做到,難道因為
CPU die之間還有直接的互聯?
總結
對Zen2評價,我想說的就是強,相對於Zen1來說,基本是360度全方位的大幅提升。而且
CCD間的低延遲設計,如果應用來未來的Threadripper上,可以規避掉它本來的弱點,不
再需要進行特別的NUMA優化了,所以不止Ryzen3000,對於未來的Threadripper,我都非
常看好。
=====
還自行寫程式測試,並且比對 skylake 架構
蠻有趣的文章,分享
最後延遲真的是假問題 不管IOH還是CCD
--
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3C
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