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

[DukenukemX]

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/

 

[Lakados]

RISC is fantastic for building custom high-performance microcontrollers, but it is still a very long way away from being a general computing device.

 

[Teenyman45]

RISC is fantastic for building custom high-performance microcontrollers, but it is still a very long way away from being a general computing device.

But that documentary / futurist film Hackers predicted that RISC would change everything?!


View: https://youtu.be/yVo9_h3-zwQ?t=16

 

[ZeqOBpf6]

Risc is good

 

[Lakados]

But that documentary / futurist film Hackers predicted that RISC would change everything?!


View: https://youtu.be/yVo9_h3-zwQ?t=16

It did, modern storage wouldn’t be feasible without it, neither would our current DDR and GDDR memory formats.

 

[serpretetsky]

Sounds like it only affects t-head c910 and c908 processors?

 

[serpretetsky]

RISCV is fantastic for building custom high-performance microcontrollers, but it is still a very long way away from being a general computing device.

Fixed

 

[Halon]

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.

 

[Red Falcon]

No RISC no reward.
This was a RISC-V move.

 

[uOpt]

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.