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| author | Eric Dumazet <edumazet@google.com> | 2017-09-13 11:16:45 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-13 13:30:53 -0700 |
| commit | ca558e185972d8ecd308760abf972f5d408bcff0 (patch) | |
| tree | 2edce2014072127cb43820fed3635ef5d6d4b6ec /net/dcb | |
| parent | d371465e81fc740cfa67ef47fbf692350c6b0113 (diff) | |
net_sched: gen_estimator: fix scaling error in bytes/packets samples
Denys reported wrong rate estimations with HTB classes.
It appears the bug was added in linux-4.10, since my tests
where using intervals of one second only.
HTB using 4 sec default rate estimators, reported rates
were 4x higher.
We need to properly scale the bytes/packets samples before
integrating them in EWMA.
Tested:
echo 1 >/sys/module/sch_htb/parameters/htb_rate_est
Setup HTB with one class with a rate/cail of 5Gbit
Generate traffic on this class
tc -s -d cl sh dev eth0 classid 7002:11
class htb 7002:11 parent 7002:1 prio 5 quantum 200000 rate 5Gbit ceil
5Gbit linklayer ethernet burst 80000b/1 mpu 0b cburst 80000b/1 mpu 0b
level 0 rate_handle 1
Sent 1488215421648 bytes 982969243 pkt (dropped 0, overlimits 0
requeues 0)
rate 5Gbit 412814pps backlog 136260b 2p requeues 0
TCP pkts/rtx 982969327/45 bytes 1488215557414/68130
lended: 22732826 borrowed: 0 giants: 0
tokens: -1684 ctokens: -1684
Fixes: 1c0d32fde5bd ("net_sched: gen_estimator: complete rewrite of rate estimators")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Denys Fedoryshchenko <nuclearcat@nuclearcat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dcb')
0 files changed, 0 insertions, 0 deletions