• Tuong Lien's avatar
    tipc: enable broadcast retrans via unicast · a91d55d1
    Tuong Lien authored
    In some environment, broadcast traffic is suppressed at high rate (i.e.
    a kind of bandwidth limit setting). When it is applied, TIPC broadcast
    can still run successfully. However, when it comes to a high load, some
    packets will be dropped first and TIPC tries to retransmit them but the
    packet retransmission is intentionally broadcast too, so making things
    worse and not helpful at all.
    
    This commit enables the broadcast retransmission via unicast which only
    retransmits packets to the specific peer that has really reported a gap
    i.e. not broadcasting to all nodes in the cluster, so will prevent from
    being suppressed, and also reduce some overheads on the other peers due
    to duplicates, finally improve the overall TIPC broadcast performance.
    
    Note: the functionality can be turned on/off via the sysctl file:
    
    echo 1 > /proc/sys/net/tipc/bc_retruni
    echo 0 > /proc/sys/net/tipc/bc_retruni
    
    Default is '0', i.e. the broadcast retransmission still works as usual.
    Acked-by: default avatarYing Xue <ying.xue@windriver.com>
    Acked-by: default avatarJon Maloy <jmaloy@redhat.com>
    Signed-off-by: default avatarTuong Lien <tuong.t.lien@dektech.com.au>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    a91d55d1
sysctl.c 3.21 KB