• Eric Dumazet's avatar
    net_sched: move TCQ_F_THROTTLED flag · fd245a4a
    Eric Dumazet authored
    In commit 37112105 (net: QDISC_STATE_RUNNING dont need atomic bit
    ops) I moved QDISC_STATE_RUNNING flag to __state container, located in
    the cache line containing qdisc lock and often dirtied fields.
    
    I now move TCQ_F_THROTTLED bit too, so that we let first cache line read
    mostly, and shared by all cpus. This should speedup HTB/CBQ for example.
    
    Not using test_bit()/__clear_bit()/__test_and_set_bit allows to use an
    "unsigned int" for __state container, reducing by 8 bytes Qdisc size.
    
    Introduce helpers to hide implementation details.
    Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
    CC: Patrick McHardy <kaber@trash.net>
    CC: Jesper Dangaard Brouer <hawk@diku.dk>
    CC: Jarek Poplawski <jarkao2@gmail.com>
    CC: Jamal Hadi Salim <hadi@cyberus.ca>
    CC: Stephen Hemminger <shemminger@vyatta.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    fd245a4a
sch_generic.h 15.8 KB