[Beowulf] Update on dealing with Spectre and Meltdown

[Prentice Bisbal]

Beowulfers,

Have any of you updated the kernels on your clusters to fix the Spectre 
and Meltdown vulnerabilities? I was following this issue closely for the 
first couple of weeks. There seemed to be a lack of consensus on how 
much these fixed would impact HPC jobs, and if I recall correctly, some 
of the patches really hurt performance, or caused other problems. We 
took a wait-and-see approach here. So now that I've waited a while, what 
did you see?

-- 
Prentice