[Cake] a couple quick test runs of the v17+1 patchset

[Dave Taht]

The paper makes the claim that we can shape to .1% of the bandwidth
and win. Well, at gigE rates, it's closer to .2%, as setting the
shaper to 980mbit got consistently sub 2.2ms RTT latency on the rrul
test, higher usually cracked 5 or 6, while bandwidth went from 934 to
936. So we can take a .2%-ish bandwidth hit in exchange for reducing
the max latency by 2/3s on this particular test series.

And this of course ignores the impact of flow control, my environment,
academic rigor, etc, etc. And I shudder to go measure the cpu
overhead.

And it didn't crash, and perhaps I'll go play with cake with veth
simulating > gigE bandwidths.

Only question is: why is the capacity estimate 970mbit?

root at spaceheater:~/git/linux/tc-adv/tc# ./tc -s qdisc show dev enp6s0
qdisc cake 8017: root refcnt 2 bandwidth 980Mbit diffserv3
triple-isolate split-gso rtt 100.0ms raw overhead 0
 Sent 23871634960 bytes 17506050 pkt (dropped 2, overlimits 30089616 requeues 7)
 backlog 370996b 246p requeues 7
 memory used: 1053008b of 15140Kb
 capacity estimate: 970Mbit
 min/max network layer size:           42 /    1514
 min/max overhead-adjusted size:       42 /    1514
 average network hdr offset:           14

                   Bulk  Best Effort        Voice
  thresh      61250Kbit      980Mbit      245Mbit
  target          5.0ms        5.0ms        5.0ms
  interval      100.0ms      100.0ms      100.0ms
  pk_delay        4.1ms        3.2ms        4.2ms
  av_delay        2.3ms        2.4ms        3.1ms
  sp_delay        231us        642us        321us
  backlog        27318b      263436b       80242b
  pkts          1476388     11611873      4418037
  bytes      1497338404  16405801643   5968868937
  way_inds            0            8            0
  way_miss           12          209           15
  way_cols            0            0            0
  drops               2            0            0
  marks               0            0            0
  ack_drop            0            0            0
  sp_flows            2            4            3
  bk_flows            1            2            1
  un_flows            0            0            0
  max_len         68130        68130        68130
  quantum          1514         1514         1514






-- 

Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619