* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> [...] And not look at vsyscalls or anything, but look at what
> schednuma does wrong!
I have started 4 independent lines of inquiry to figure out
what's wrong on David's system, and all four are in the category
of 'what does our tree do to cause a regression':
- suboptimal (== regressive) 4K fault handling by numa/core
- suboptimal (== regressive) placement by numa/core on David's
assymetric-topology system
- vsyscalls escallating numa/core page fault overhead
non-linearly
- TLB flushes escallating numacore page fault overhead
non-linearly
I have sent patches for 3 of them, one is still work in
progress, because it's non-trivial.
I'm absolutely open to every possibility and obviously any
regression is numa/core's fault, full stop.
What would you have done differently to handle this particular
regression?
Thanks,
Ingo
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