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linux

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    Sowmini Varadhan authored and David S. Miller committed
    Using the value of RDS_TCP_DEFAULT_BUFSIZE (128K)
    clobbers efficient use of TSO because it inflates the size_goal
    that is computed in tcp_sendmsg/tcp_sendpage and skews packet
    latency, and the default values for these parameters actually
    results in significantly better performance.
    
    In request-response tests using rds-stress with a packet size of
    100K with 16 threads (test parameters -q 100000 -a 256 -t16 -d16)
    between a single pair of IP addresses achieves a throughput of
    6-8 Gbps. Without this patch, throughput maxes at 2-3 Gbps under
    equivalent conditions on these platforms.
    
    Signed-off-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    1edd6a14
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