Re: BQL + Basic Latency under load results - 100Mbit, GSO/TSO off, pfifo_fast vs SFQ vs QFQ

Le lundi 02 janvier 2012 à 06:07 +0100, Eric Dumazet a écrit :

And after disabling TSO (as you did in your tests) I get this :
(Note my link is Gigabit, so I had to install a HTB shaper to 100Mbit to
mimic your workload)

# ping -c 20 192.168.20.112
PING 192.168.20.112 (192.168.20.112) 56(84) bytes of data.
64 bytes from 192.168.20.112: icmp_req=1 ttl=64 time=0.113 ms
64 bytes from 192.168.20.112: icmp_req=2 ttl=64 time=0.153 ms
64 bytes from 192.168.20.112: icmp_req=3 ttl=64 time=0.092 ms
64 bytes from 192.168.20.112: icmp_req=4 ttl=64 time=0.095 ms
64 bytes from 192.168.20.112: icmp_req=5 ttl=64 time=0.176 ms
64 bytes from 192.168.20.112: icmp_req=6 ttl=64 time=0.159 ms
64 bytes from 192.168.20.112: icmp_req=7 ttl=64 time=0.169 ms
64 bytes from 192.168.20.112: icmp_req=8 ttl=64 time=0.122 ms
64 bytes from 192.168.20.112: icmp_req=9 ttl=64 time=0.148 ms
64 bytes from 192.168.20.112: icmp_req=10 ttl=64 time=0.123 ms
64 bytes from 192.168.20.112: icmp_req=11 ttl=64 time=0.186 ms
64 bytes from 192.168.20.112: icmp_req=12 ttl=64 time=0.210 ms
64 bytes from 192.168.20.112: icmp_req=13 ttl=64 time=0.142 ms
64 bytes from 192.168.20.112: icmp_req=14 ttl=64 time=0.134 ms
64 bytes from 192.168.20.112: icmp_req=15 ttl=64 time=0.092 ms
64 bytes from 192.168.20.112: icmp_req=16 ttl=64 time=0.187 ms
64 bytes from 192.168.20.112: icmp_req=17 ttl=64 time=0.123 ms
64 bytes from 192.168.20.112: icmp_req=18 ttl=64 time=0.159 ms
64 bytes from 192.168.20.112: icmp_req=19 ttl=64 time=0.142 ms
64 bytes from 192.168.20.112: icmp_req=20 ttl=64 time=0.207 ms

--- 192.168.20.112 ping statistics ---

20 packets transmitted, 20 received, 0% packet loss, time 18999ms
rtt min/avg/max/mdev = 0.092/0.146/0.210/0.037 ms

# tc -s -d cl show dev eth3
class htb 1:1 root leaf 10: prio 0 quantum 80000 rate 100000Kbit ceil 100000Kbit 
burst 40000b/256 mpu 0b overhead 0b cburst 40000b/256 mpu 0b overhead 0b level 0 
 Sent 4569893772 bytes 3107171 pkt (dropped 43457, overlimits 0 requeues 0) 
 rate 75836Kbit 6315pps backlog 0b 127p requeues 0 
 lended: 1204316 borrowed: 0 giants: 0
 tokens: -1892 ctokens: -1892

class sfq 10:1b parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:25 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:34 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:48 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:4b parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot -448 

class sfq 10:4c parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:68 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:96 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:a9 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:c8 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:ca parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:112 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:11a parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:149 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:150 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:16b parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:171 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:185 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:19f parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:1ac parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:1bb parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:1bf parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:1dc parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:1e7 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:1f1 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:201 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:20f parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:216 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:21d parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:22a parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:22e parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:263 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:2d4 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:306 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:307 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:344 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:346 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:34f parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:359 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:36f parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:385 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:3a0 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:3a4 parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 1514b 1p requeues 0 
 allot 0 

class sfq 10:3ac parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 3028b 2p requeues 0 
 allot 1520 

class sfq 10:3ee parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520 

class sfq 10:3fe parent 10: 
 (dropped 0, overlimits 0 requeues 0) 
 backlog 4542b 3p requeues 0 
 allot 1520