net_sched: htb: do not setup default rate estimators

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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: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2013-06-06 14:53:16 -07:00 • committed by David S. Miller

parent 130d3d68b5

commit 64153ce0a7

1 changed files with 12 additions and 6 deletions

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net/sched/sch_htb.c

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