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pkt_sched: fq: increase max delay from 125 ms to one second 

FQ/pacing has a clamp of delay of 125 ms, to avoid some possible harm.

It turns out this delay is too small to allow pacing low rates :
Some ISP setup very aggressive policers as low as 16kbit.

Now TCP stack has spurious rtx prevention, it seems safe to increase
this fixed parameter, without adding a qdisc attribute.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-11-25 08:57:29 -08:00 committed by David S. Miller
parent d3fc6b3fdd
commit ced7a04e39
1 changed files with 4 additions and 5 deletions
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9
net/sched/sch_fq.c
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@ -481,12 +481,11 @@ begin:
if (likely(rate))
do_div(len, rate);
/* Since socket rate can change later,
* clamp the delay to 125 ms.
* TODO: maybe segment the too big skb, as in commit
* e43ac79a4bc ("sch_tbf: segment too big GSO packets")
* clamp the delay to 1 second.
* Really, providers of too big packets should be fixed !
*/
if (unlikely(len > 125 * NSEC_PER_MSEC)) {
len = 125 * NSEC_PER_MSEC;
if (unlikely(len > NSEC_PER_SEC)) {
len = NSEC_PER_SEC;
q->stat_pkts_too_long++;
}