In message from Mark Hahn <h...@mcmaster.ca> (Fri, 23 Mar 2018 16:02:12 -0400
(EDT)):
There *is* an updated microcode data file:
https://downloadcenter.intel.com/product/873/Processors
which seems to correspond to the document above
How I believe, it's for correction of general defect practically for all
CPUs.
Then microcode update may give also decrease of performance. May be Intel
have idea to improve this update and do not recommend use this version ?
I don't quite understand what you're saying. Yes, it's expected that
the mitigations for meltdown and spectre have performance costs.
meltdown is pretty much taken care of by the way newer kernels avoid
mapping all physical memory. afaikt, the microcode changes are supposed
to mitigate the exfiltration risk for spectre, in combination with kernel
tweaks (retpoline, some extra patterns of fence instructions).
my appeal is for information about microcode updates that Intel claims
are now recommended for production use, and which only appeared in March.
regards, mark hahn.
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