* [Cake] a couple quick test runs of the v17+1 patchset
@ 2018-05-30 20:39 Dave Taht
2018-05-30 20:53 ` Dave Taht
0 siblings, 1 reply; 2+ messages in thread
From: Dave Taht @ 2018-05-30 20:39 UTC (permalink / raw)
To: Cake List
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@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
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [Cake] a couple quick test runs of the v17+1 patchset
2018-05-30 20:39 [Cake] a couple quick test runs of the v17+1 patchset Dave Taht
@ 2018-05-30 20:53 ` Dave Taht
0 siblings, 0 replies; 2+ messages in thread
From: Dave Taht @ 2018-05-30 20:53 UTC (permalink / raw)
To: Cake List
And I was being an idiot. Using the ethernet keyword to account for
the framing overhead AND shaping to 1Gbit,
I got local latency results twice as good as what I can get from
sch_fq, no muss, no fuss, and no loss of bandwidth vs the unshaped
mode.
Hardware flow control will still defeat us, but....
Summary of rrul test run 'v17-cake-1gbit-ethernet' (at 2018-05-30
20:48:14.853980):
avg median # data pts
Ping (ms) ICMP : 1.74 1.88 ms 347
Ping (ms) UDP BE : 879.31 2.21 ms 349
Ping (ms) UDP BK : 853.93 2.25 ms 349
Ping (ms) UDP EF : 879.93 2.21 ms 349
Ping (ms) avg : 653.73 2.13 ms 350
TCP download BE : 230.61 230.58 Mbits/s 299
TCP download BK : 230.81 230.70 Mbits/s 299
TCP download CS5 : 230.61 230.66 Mbits/s 299
TCP download EF : 230.21 230.58 Mbits/s 299
TCP download avg : 230.56 230.62 Mbits/s 300
TCP download sum : 922.24 922.48 Mbits/s 300
TCP totals : 1858.68 1859.31 Mbits/s 300
TCP upload BE : 322.47 322.56 Mbits/s 290
TCP upload BK : 57.57 57.47 Mbits/s 271
TCP upload CS5 : 322.39 322.49 Mbits/s 276
TCP upload EF : 234.01 234.18 Mbits/s 281
TCP upload avg : 234.11 234.18 Mbits/s 300
TCP upload sum : 936.44 936.72 Mbits/s 300
but the capacity estimate is still 970?
qdisc cake 8017: root refcnt 2 bandwidth 1Gbit diffserv3
triple-isolate split-gso rtt 100.0ms noatm overhead 38 mpu 84
Sent 51504294511 bytes 37724591 pkt (dropped 6, overlimits 64958695
requeues 12)
backlog 0b 0p requeues 12
memory used: 1053008b of 15140Kb
capacity estimate: 970Mbit
min/max network layer size: 28 / 1500
min/max overhead-adjusted size: 84 / 1538
average network hdr offset: 14
Bulk Best Effort Voice
thresh 62500Kbit 1Gbit 250Mbit
target 5.0ms 5.0ms 5.0ms
interval 100.0ms 100.0ms 100.0ms
pk_delay 5us 5us 6us
av_delay 3us 2us 2us
sp_delay 2us 1us 1us
backlog 0b 0b 0b
pkts 3164050 25030267 9530280
bytes 3227519915 35396974782 12879808898
way_inds 0 8 0
way_miss 21 366 25
way_cols 0 0 0
drops 5 0 1
marks 0 0 0
ack_drop 0 0 0
sp_flows 1 3 0
bk_flows 0 1 1
un_flows 0 0 0
max_len 68130 68130 68130
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