[openib-general] [PATCH] IPoIB CM Experimental support

[Michael S. Tsirkin]

> >The idea is to increase performance by increasing the MTU
> >from the maximum of 2K (theoretically 4K) supported by IPoIB on top of UD.
> >With this code, I'm able to get 800MByte/sec or more with netperf
> >without options on a Mellanox 4x back-to-back DDR system.
> 
> What about CPU utilization?

Seems to be about the same (about 100% of a single CPU).

UD:

# /mswg/work/mst/netperf-2.4.2/src/netperf -H 11.4.3.69 -f M -c -C
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.4.3.69 (11.4.3.69) port 0 AF_INET : demo
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    MBytes  /s  % S      % S      us/KB   us/KB

 87380  16384  16384    10.00       276.80   27.98    25.55    3.948   3.606

RC:
# /mswg/work/mst/netperf-2.4.2/src/netperf -H 11.4.3.69 -f M -c -C
TREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.4.3.69 (11.4.3.69) port 0
AF_INET : demo
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    MBytes  /s  % S      % S      us/KB   us/KB

 87380  16384  16384    10.00       907.68   25.08    24.43    1.079   1.052

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MST