On 2017-09-13 20:20, Eric Dumazet wrote:
On Wed, 2017-09-13 at 20:12 +0300, Denys Fedoryshchenko wrote:
For my case, as load increased now, i am hitting same issue (i tried
to
play with quantum / bursts as well, didnt helped):
tc -s -d class show dev eth3.777 classid 1:111;sleep 5;tc -s -d class
show dev eth3.777 classid 1:111
class htb 1:111 parent 1:1 leaf 111: prio 0 quantum 50000 rate 20Gbit
ceil 100Gbit linklayer ethernet burst 100000b/1 mpu 0b cburst
100000b/1
mpu 0b level 0
Sent 864151559 bytes 730566 pkt (dropped 15111, overlimits 0
requeues
0)
backlog 73968000b 39934p requeues 0
lended: 499867 borrowed: 0 giants: 0
tokens: 608 ctokens: 121
You have drops (and ~40,000 packets in backlog)
class htb 1:111 parent 1:1 leaf 111: prio 0 quantum 50000 rate 20Gbit
ceil 100Gbit linklayer ethernet burst 100000b/1 mpu 0b cburst
100000b/1
mpu 0b level 0
Sent 1469352160 bytes 1243649 pkt (dropped 42933, overlimits 0
requeues
0)
backlog 82536047b 39963p requeues 0
lended: 810475 borrowed: 0 giants: 0
tokens: 612 ctokens: 122
(1469352160-864151559)/5*8
968320961.60000000000000000000
Less than 1Gbit and it's being throttled
It is not : "overlimits 0" means this class was not throttled.
Overlimits never appear in HTB as i know, here is simulation on this
class that have constant "at least" 1G traffic, i throttled it to 1Kbit
to simulate forced drops:
shapernew ~ # sh /etc/shaper.cfg;sleep 1;tc -s -d class show dev
eth3.777 classid 1:111;tc qdisc del dev eth3.777 root
class htb 1:111 parent 1:1 leaf 111: prio 0 quantum 50000 rate 1Kbit
ceil 1Kbit linklayer ethernet burst 31280b/1 mpu 0b cburst 31280b/1 mpu
0b level 0
Sent 134350019 bytes 117520 pkt (dropped 7819, overlimits 0 requeues 0)
backlog 7902126b 4976p requeues 0
lended: 86694 borrowed: 0 giants: 0
tokens: -937500000 ctokens: -937500000
