* [Cake] 450 up stream test
@ 2015-04-22 8:34 Dave Taht
2015-04-23 16:35 ` Adrian Popescu
0 siblings, 1 reply; 2+ messages in thread
From: Dave Taht @ 2015-04-22 8:34 UTC (permalink / raw)
To: cake
I was finally able to induce "way" collisions and codel was not able
to successfully control the depth of the queue in this test of 9
copies of the 50 up test....
root@nuc-client:~/git/iproute2-cake# tc -s qdisc show dev eth0
qdisc cake 8003: root refcnt 2 bandwidth 920Mbit diffserv4 flows
Sent 13826214606 bytes 10775480 pkt (dropped 187301, overlimits
7841897 requeues 79)
backlog 1732937b 769p requeues 79
Class 0 Class 1 Class 2 Class 3
rate 920Mbit 862500Kbit 690Mbit 230Mbit
target 5.0ms 5.0ms 5.0ms 5.0ms
interval 105.0ms 105.0ms 105.0ms 105.0ms
Pk delay 0us 22.0ms 0us 19us
Av delay 0us 12.0ms 0us 1us
Sp delay 0us 3.8ms 0us 1us
pkts 305686 4248957 0 520011
way inds 0 504555 0 0
way miss 3 165303 0 7
way cols 0 4656 0 0
bytes 1040146583 11540379317 0 1730046460
drops 38 187176 0 87
marks 0 0 0 0
We dont have a good way to plot a test this extreme, and offloads do
hurt a lot. I turned off offloads to see what would happen:
root@nuc-client:~/git/iproute2-cake# tc -s qdisc show dev eth0
qdisc cake 8004: root refcnt 2 bandwidth 920Mbit diffserv4 flows
Sent 3147074201 bytes 2948700 pkt (dropped 115035, overlimits 4207356
requeues 417)
backlog 1592366b 1159p requeues 417
Class 0 Class 1 Class 2 Class 3
rate 920Mbit 862500Kbit 690Mbit 230Mbit
target 5.0ms 5.0ms 5.0ms 5.0ms
interval 105.0ms 105.0ms 105.0ms 105.0ms
Pk delay 0us 26.2ms 0us 9us
Av delay 0us 12.2ms 0us 0us
Sp delay 0us 4.7ms 0us 0us
pkts 0 3064884 0 10
way inds 0 456896 0 0
way miss 0 106191 0 2
way cols 0 1085 0 0
bytes 0 3322825235 0 1186
drops 0 115035 0 0
marks 0 0 0 0
--
Dave Täht
Open Networking needs **Open Source Hardware**
https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Cake] 450 up stream test
2015-04-22 8:34 [Cake] 450 up stream test Dave Taht
@ 2015-04-23 16:35 ` Adrian Popescu
0 siblings, 0 replies; 2+ messages in thread
From: Adrian Popescu @ 2015-04-23 16:35 UTC (permalink / raw)
To: Dave Taht; +Cc: cake
I've also observed higher packet delay on the second class with a
single stream with a rate limiter. Setting a rate limit of 50mbps
seems to be inducing latency as that stream goes up towards the limit.
I haven't checked if there were other competing streams which were
actually seeing that latency.
On Wed, Apr 22, 2015 at 11:34 AM, Dave Taht <dave.taht@gmail.com> wrote:
> I was finally able to induce "way" collisions and codel was not able
> to successfully control the depth of the queue in this test of 9
> copies of the 50 up test....
>
> root@nuc-client:~/git/iproute2-cake# tc -s qdisc show dev eth0
> qdisc cake 8003: root refcnt 2 bandwidth 920Mbit diffserv4 flows
> Sent 13826214606 bytes 10775480 pkt (dropped 187301, overlimits
> 7841897 requeues 79)
> backlog 1732937b 769p requeues 79
> Class 0 Class 1 Class 2 Class 3
> rate 920Mbit 862500Kbit 690Mbit 230Mbit
> target 5.0ms 5.0ms 5.0ms 5.0ms
> interval 105.0ms 105.0ms 105.0ms 105.0ms
> Pk delay 0us 22.0ms 0us 19us
> Av delay 0us 12.0ms 0us 1us
> Sp delay 0us 3.8ms 0us 1us
> pkts 305686 4248957 0 520011
> way inds 0 504555 0 0
> way miss 3 165303 0 7
> way cols 0 4656 0 0
> bytes 1040146583 11540379317 0 1730046460
> drops 38 187176 0 87
> marks 0 0 0 0
>
> We dont have a good way to plot a test this extreme, and offloads do
> hurt a lot. I turned off offloads to see what would happen:
>
> root@nuc-client:~/git/iproute2-cake# tc -s qdisc show dev eth0
> qdisc cake 8004: root refcnt 2 bandwidth 920Mbit diffserv4 flows
> Sent 3147074201 bytes 2948700 pkt (dropped 115035, overlimits 4207356
> requeues 417)
> backlog 1592366b 1159p requeues 417
> Class 0 Class 1 Class 2 Class 3
> rate 920Mbit 862500Kbit 690Mbit 230Mbit
> target 5.0ms 5.0ms 5.0ms 5.0ms
> interval 105.0ms 105.0ms 105.0ms 105.0ms
> Pk delay 0us 26.2ms 0us 9us
> Av delay 0us 12.2ms 0us 0us
> Sp delay 0us 4.7ms 0us 0us
> pkts 0 3064884 0 10
> way inds 0 456896 0 0
> way miss 0 106191 0 2
> way cols 0 1085 0 0
> bytes 0 3322825235 0 1186
> drops 0 115035 0 0
> marks 0 0 0 0
>
>
> --
> Dave Täht
> Open Networking needs **Open Source Hardware**
>
> https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67
> _______________________________________________
> Cake mailing list
> Cake@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/cake
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