net_sched: htb: do not setup default rate estimators
With a thousand htb classes, est_timer() spends ~5 million cpu cycles and throws out cpu cache, because each htb class has a default rate estimator (est 4sec 16sec). Most users do not use default rate estimators, so switch htb to not setup ones. Add a module parameter (htb_rate_est) so that users relying on this default rate estimator can revert the behavior. echo 1 >/sys/module/sch_htb/parameters/htb_rate_est Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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