[Beowulf] Intel CPU design bug & security flaw - kernel fix imposes performance penalty
Ellis H. Wilson III
ellis at ellisv3.com
Wed Jan 3 09:57:48 PST 2018
On 01/03/2018 12:47 PM, Lux, Jim (337K) wrote:
> I suppose the down side is that if they do kernel mods to fix this
> for the 99.9%, it adversely affects the performance for the 0.1%
> (that is, us).
We've been discussing this extensively at my workplace, and the
overwhelming expectation is that at least in Linux the fix should be
configurable such that those operating in non-multitenant systems (such
as scale-out storage appliances) can disable it.
If this ends up not being the case, I would expect it in the short-term
to lock us out of upgrading to newer kernels where the fix and resultant
overheads come into play until we're on newer CPUs where the
architecture deficiency is resolved. This latter part (the expectation
of Intel fixing it in their newer HW) is all the more reason I'm
inclined to believe the fix will be delivered as a tunable.
Ellis H. Wilson III, Ph.D.
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