• Eric Dumazet's avatar
    net: extend sk_pacing_rate to unsigned long · 76a9ebe8
    Eric Dumazet authored
    
    
    sk_pacing_rate has beed introduced as a u32 field in 2013,
    effectively limiting per flow pacing to 34Gbit.
    
    We believe it is time to allow TCP to pace high speed flows
    on 64bit hosts, as we now can reach 100Gbit on one TCP flow.
    
    This patch adds no cost for 32bit kernels.
    
    The tcpi_pacing_rate and tcpi_max_pacing_rate were already
    exported as 64bit, so iproute2/ss command require no changes.
    
    Unfortunately the SO_MAX_PACING_RATE socket option will stay
    32bit and we will need to add a new option to let applications
    control high pacing rates.
    
    State      Recv-Q Send-Q Local Address:Port             Peer Address:Port
    ESTAB      0      1787144  10.246.9.76:49992             10.246.9.77:36741
                     timer:(on,003ms,0) ino:91863 sk:2 <->
     skmem:(r0,rb540000,t66440,tb2363904,f605944,w1822984,o0,bl0,d0)
     ts sack bbr wscale:8,8 rto:201 rtt:0.057/0.006 mss:1448
     rcvmss:536 advmss:1448
     cwnd:138 ssthresh:178 bytes_acked:256699822585 segs_out:177279177
     segs_in:3916318 data_segs_out:177279175
     bbr:(bw:31276.8Mbps,mrtt:0,pacing_gain:1.25,cwnd_gain:2)
     send 28045.5Mbps lastrcv:73333
     pacing_rate 38705.0Mbps delivery_rate 22997.6Mbps
     busy:73333ms unacked:135 retrans:0/157 rcv_space:14480
     notsent:2085120 minrtt:0.013
    Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    76a9ebe8