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GhostWrite Vulnerability Affects RISC-V CPU, Mitigating Takes A ~77% Performance Hit

DukenukemX

DukenukemX

[H]F Junkie
Joined
Jan 30, 2005
Messages
11,195
Future CPU architecture you say?
"The researchers believe the only way to address the GhostWrite vulnerability is disabling the vector extension of the CPU and in turn negatively impacting the performance. The researchers peg the overhead at around 77% to disabling the RISC-V vector extension support to mitigate GhostWrite. "

https://www.phoronix.com/news/GhostWrite-Vulnerability-RISC-V
https://ghostwriteattack.com/

ghostwrite.svg
 
This chip was the basis of the SoC in the Milk-V Pioneer, a ~$1500 64 core behemoth. I’ll bet customers and Milk-V alike are having a really awful time with this info.
 
That 77% performance loss claim is garbage. You'll have to disable the vector extension, but that does nothing for many workloads, e.g. compilation.
 
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