Any experience of Meltdown/Spectre patches impact on Mellanox OFED? stability? performance?

Hi

Any experience of Meltdown/Spectre patches impact on Mellanox OFED? stability? performance?

HI,

Maybe it will help to your question:

Mellanox Mitigates Meltdown Mess, Stops Spectre Security Slowdown | Mellanox Technologies Blog Mellanox Technologies Blo… http://www.mellanox.com/blog/2018/02/spectre-meltdown-restore-security-performance-patches-mellanox-offload-technologies/

http://mellanox.com/related-docs/technical-briefs/TN_Spectre-Meltdown.pdf http://mellanox.com/related-docs/technical-briefs/TN_Spectre-Meltdown.pdf

Hi

Thanks for pointing out these papers, unfortunately the seems to be written by someone in the marketing department rather than a technologist. There is some sever confusion over what TCP Offload/onload implies,

The main impact of Meltdown is that the mitigation of it implies use of KPTI (Kernel page table isolation),

which makes transitions from User mode to Kernel and back more expensive.

The good news is that “User mode IP stacks” minimizes such transitions,

E.g. Mellanox VMA, Solarflare Onload, and Intel DPDK are examples of such technologies.

I.e. it is NOT the adapters per see which helps, other than by enabling user mode IP stacks.

I definitely lack some explicit mention of VMA in the articles,

since that is the most relevant Mellanox technology for the issue.

/HW

Hi

I know team working on it.

But up to now it steel not public share.