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    net_sched: remove generic throttled management · 45f50bed
    Eric Dumazet 提交于
    __QDISC_STATE_THROTTLED bit manipulation is rather expensive
    for HTB and few others.
    
    I already removed it for sch_fq in commit f2600cf0
    ("net: sched: avoid costly atomic operation in fq_dequeue()")
    and so far nobody complained.
    
    When one ore more packets are stuck in one or more throttled
    HTB class, a htb dequeue() performs two atomic operations
    to clear/set __QDISC_STATE_THROTTLED bit, while root qdisc
    lock is held.
    
    Removing this pair of atomic operations bring me a 8 % performance
    increase on 200 TCP_RR tests, in presence of throttled classes.
    
    This patch has no side effect, since nothing actually uses
    disc_is_throttled() anymore.
    Signed-off-by: NEric Dumazet <edumazet@google.com>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    45f50bed
sch_hfsc.c 40.2 KB