Messages in this thread | | | Date | Mon, 04 Mar 2002 08:59:10 -0800 | From | "Martin J. Bligh" <> | Subject | Re: 2.4.19pre1aa1 |
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> Not stability per se, but you have to admit the VM tends to > behave badly when there's a shortage in just one memory zone. > I believe NUMA will only make this situation worse.
rmap would seem to buy us (at least) two major things for NUMA:
1) We can balance between zones easier by "swapping out" pages to another zone.
2) We can do local per-node scanning - no need to bounce information to and fro across the interconnect just to see what's worth swapping out.
I suspect that the performance of NUMA under memory pressure without the rmap stuff will be truly horrific, as we decend into a cache-trashing page transfer war.
I can't see any way to fix this without some sort of rmap - any other suggestions as to how this might be done?
Thanks,
Martin.
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