Hi, I am new to cake and just messing around currently.
I notice that on my setup with vdsl2 20mbit sync the default 5ms target
on best effort hurts netperf throughput a bit as latency to host rises.
My setup.
tc qdisc add dev ppp0 handle 1:0 root cake bandwidth 19690kbit raw
overhead 34 diffserv4
Where ppp0 is pppoe.
qdisc cake 1: root refcnt 2 bandwidth 19690Kbit diffserv4 triple-isolate
rtt 100.0ms noatm overhead 56 via-ethernet
Sent 3250414679 bytes 5976629 pkt (dropped 3404, overlimits 3402556
requeues 0)
backlog 0b 0p requeues 0
memory used: 221952b of 4Mb
capacity estimate: 19690Kbit
Bulk Best Effort Video Voice
thresh 1230Kbit 19690Kbit 9845Kbit 4922Kbit
target 14.8ms 5.0ms 5.0ms 5.0ms
interval 109.8ms 100.0ms 100.0ms 100.0ms
pk_delay 63us 9us 0us 146us
av_delay 7us 6us 0us 10us
sp_delay 4us 4us 0us 4us
pkts 1237775 4725460 0 16798
bytes 1781536029 1472719560 0 1224478
way_inds 11 43327 0 1
way_miss 14051 69600 0 3066
way_cols 0 0 0 0
drops 81 3323 0 0
marks 0 0 0 0
sp_flows 36 1 0 0
bk_flows 1 0 0 0
un_flows 0 0 0 0
max_len 1500 1500 0 1428
Testing to flent-eu.bufferbloat.net which is 50ms from me, putting
a single netperf upload into bulk gets up to 0.6 - 1mbit better throughput
that if it goes through best effort.
Trying a simulation on lan with netem and cake vs hfsc 100p fifo also
shows that latency doesn't need to rise much to start hurting netperf
throughput.
Is there any way or plans to allow users to relax slightly the target?
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