[Lustre-discuss] OSSes on dual IOH motherboards
mark at msi.umn.edu
Thu Jun 2 18:23:18 PDT 2011
I was wondering if anyone here has looked at the performance
characteristics of lustre OSSes on dual tylersburg motherboards with
raid controllers split up onto separate IO hubs. I imagine that without
proper pinning of service threads to the right CPUs/IOH and memory pools
this could cause some nasty QPI contention. Is this actually a problem
in practice? Is it possible to pin service threads in a reasonable way
based on which OST is involved? Anyone doing this on purpose to try and
gain more overall PCIE bandwidth?
I imagine that in general it's probably best to stick with a single
socket single IOH OSS. No pinning to worry about, very direct QPI
setup, consistent performance characteristics, etc.
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