[Beowulf] Intel CPU design bug & security flaw - kernel fix imposes performance penalty
joe.landman at gmail.com
Wed Jan 3 09:57:48 PST 2018
Looks like it will respond to a 'nopti' boot option (at least the
patches I've seen from 4-Dec)
On 01/03/2018 12:57 PM, Ellis H. Wilson III wrote:
> 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.
e: joe.landman at gmail.com
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