[lustre-discuss] weird issue w. lnet routers
john at chiraldynamics.com
Tue Nov 28 17:21:10 PST 2017
just built a system w. lnet routers that bridge Infiniband & 100GbE, using Centos built in Infiniband support
servers are Infiniband, clients are 100GbE (connectx-4 cards)
my direct write performance from clients over Infiniband is around 15GB/s
When I introduced the lnet routers, performance dropped to 10GB/s
Thought the problem was an MTU of 1500, but when I changed the MTUs to 9000
performance dropped to 3GB/s.
When I tuned according to John Fragella's LUG slides, things went even slower (1.5GB/s write)
does anyone have any ideas on what I'm doing wrong??
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