• Hariprasad Shenai's avatar
    cxgb4: Add low latency socket busy_poll support · 3a336cb1
    Hariprasad Shenai authored
    cxgb_busy_poll, corresponding to ndo_busy_poll, gets called by the socket
    waiting for data.
    
    With busy_poll enabled, improvement is seen in latency numbers as observed by
    collecting netperf TCP_RR numbers.
    Below are latency number, with and without busy-poll, in a switched environment
    for a particular msg size:
    netperf command: netperf -4 -H <ip> -l 30 -t TCP_RR -- -r1,1
    Latency without busy-poll: ~16.25 us
    Latency with busy-poll   : ~08.79 us
    
    Based on original work by Kumar Sanghvi <kumaras@chelsio.com>
    Signed-off-by: default avatarHariprasad Shenai <hariprasad@chelsio.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    3a336cb1
cxgb4.h 42.4 KB