[Beowulf] MPI performance gain with jumbo frames
Paulo Afonso Lopes
pal at di.fct.unl.pt
Wed Jun 13 19:00:33 EDT 2007
I can report a decrease of circa 10% CPU use per GbE link in an IBM x335
(dual Xeon 2.6GHz) with on-board Broadcom NICs and SMC switch, when going
from standard 1500 to 9K frames on the netperf benchmark, at full
bandwidth (circa 80MB/s).
> Doug and Jeff have good points (and some good links). On thing to
> also pay attention to is the CPU utilization during the bandwidth and
> application testing. We found that on our cluster (various Dells
> with built in GigE NICs) while we did not see huge differences in
> effective bandwidth, the CPU overhead was notably less when using
> Jumbo Frames.
> Again, YMMV.
> Good luck,
Paulo Afonso Lopes | Tel: +351- 21 294 8536
Departamento de Informática | 294 8300 ext.10763
Faculdade de Ciências e Tecnologia | Fax: +351- 21 294 8541
Universidade Nova de Lisboa | e-mail: pal at di.fct.unl.pt
2829-516 Caparica, PORTUGAL
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