Re: Slow performance with librspreload.so

[Gandalf Corvotempesta <gandalf.corvotempesta-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

2013/9/3 Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>:
> With mthca, due to quirk, optimal performance is achieved at 1K MTU.
> OpenSM can reduce the MTU in returned PathRecords to 1K when one end of
> the path is mthca and actual path MTU is > 1K. This is controlled by
> enable_quirks config parameter which defaults to FALSE (don't do this).

I'll try.

Actually these are my results, from node1 to node2

$ sudo qperf -ub  172.17.0.2 rc_bi_bw rc_lat rc_bw rc_rdma_read_lat
rc_rdma_read_bw rc_rdma_write_lat rc_rdma_write_bw tcp_lat tcp_bw
rc_bi_bw:
    bw  =  20.5 Gb/sec
rc_lat:
    latency  =  15.4 us
rc_bw:
    bw  =  13.7 Gb/sec
rc_rdma_read_lat:
    latency  =  12.9 us
rc_rdma_read_bw:
    bw  =  11.5 Gb/sec
rc_rdma_write_lat:
    latency  =  15.2 us
rc_rdma_write_bw:
    bw  =  13.7 Gb/sec
tcp_lat:
    latency  =  48.8 us
tcp_bw:
    bw  =  12.5 Gb/sec

I don't know if they are good for a DDR fabric.
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