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.
Best,
ellis
--
Joe Landman
e: joe.land...@gmail.com
t: @hpcjoe
w: https://scalability.org
g: https://github.com/joelandman
l: https://www.linkedin.com/in/joelandman
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