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SubjectRe: [RFC 2/2] Introduce sysctl(s) for the migration costs
On Fri, 2018-02-09 at 12:33 -0500, Steven Sistare wrote:
> On 2/9/2018 12:08 PM, Mike Galbraith wrote:
> > Shrug. It's bogus no mater what we do. Once Upon A Time, a cost
> > number was generated via measurement, but the end result was just as
> > bogus as a number pulled out of the ether.  How much bandwidth you have
> > when blasting data to/from wherever says nothing about misses you avoid
> > vs those you generate.
> Yes, yes and yes. I cannot make the original tunable less bogus. Using a smaller
> cost for closer caches still makes logical sense and is supported by the data.

You forgot to write "microscopic" before "data" :)  I'm mostly agnostic
about this, but don't like the yet more knobs that 99.99% won't touch.


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