CXL and Intel Sapphire Rapids

[Anton Gavriliuk]

Hi all

According to the link - https://www.servethehome.com/4th-gen-intel-xeon-scalable-sapphire-rapids-leaps-forward/9/?fbclid=IwAR0EuTqzxgH21OEEdmDkjL7XDNqO0P5zLfksFITvV3Ws1nnVWLpCqEuimdY

Latest Intel's SR CPU doesn't support CXL 1.1 type3 devices ?, only type1 & 2 ???

Why without type3 ??

There is no memory tiering without type3.

Anton

[minse...@gmail.com]

Hello,

CXL.mem is also supported in CXL type2.

Best Regards,

Minseon Ahn

[Anton Gavriliuk]

>  CXL.mem is also supported in CXL type2.

Correct.  But type2 also supports CXL.cache.

Even though a Type 2 device could technically behave as a memory expander, it's not ideal to do so. The nature of a Type 2 device is that it has a cache which also needs to be maintained...

Anton

ср, 18 янв. 2023 г. в 15:50, minse...@gmail.com <minse...@gmail.com>:

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[Yijie Zhong]

Hello,

I wonder how the type2/3 device expose the device memory to host? (through PCIe Base Address Registers?)

Can device expose memory larger or smaller than their real memory capacity?

Thanks!