The calculations make sense. I think my first attempt to test this would
be to run parallel netperfs (one netperf per class) and look at the
output of 'shorewall show tc'. That will show you what the actual speeds
are. I don't recall if netperf provides any latency data.
Well, I did quite a bit of testing in the past couple of hours, but I
am, quite frankly, unimpressed!
I used netperf's biggest brother - iperf - instead.
The values of dmax and umax do not seem to have any effect on the net
speed whatsoever - at least that is what the tests seem to indicate. The
speed limits are very strictly observed, so is the priority of each
class, but the results are roughly the same regardless of whether
dmax:umax have been specified in tcclasses (see netspeed-tests.txt
attached).
I did run "shorewall show tc eth0" (as this was the device I was testing
everything on) after each test, but there was no speed indication there
- just the number of packets passed through each class, which the result
of iperf shows anyway.
10.1.0.3 (client) -> 10.1.0.7 (server)
tcclasses
a:13 - 320kbit 320kbit 2
a:13:14 - 120kbit:60ms:1500b full 2
a:13:15 - 80kbit:100ms:1500b full 3
a:13:16 - 80kbit:224ms1500b full 4
a:13:17 - 40kbit:374ms:1500b full 5
tcrules
a:13 - 10.1.0.7 tcp 10013
a:13 - 10.1.0.7 udp 10013
a:14 - 10.1.0.7 tcp 10014
a:14 - 10.1.0.7 udp 10014
a:15 - 10.1.0.7 tcp 10015
a:15 - 10.1.0.7 udp 10015
a:16 - 10.1.0.7 tcp 10016
a:16 - 10.1.0.7 udp 10016
a:17 - 10.1.0.7 tcp 10017
a:17 - 10.1.0.7 udp 10017
iperf tests and results:
1. Class 13 (main parent) test - class speed set @ 320kbit/s
(TCP) (Server) iperf -f k -p 10013 -B 10.1.0.7 -s
(TCP) (Client) iperf -c 10.1.0.7 -p 10013 -f k -t 60
(UDP) (Server) iperf -f k -p 10013 -B 10.1.0.7 -s -u
(UDP) (Client) iperf -c 10.1.0.7 -p 10013 -f k -t 60 -u -b 400k
(Result) Interval Transfer Bandwidth Jitter
Lost/Total Datagrams
(TCP) (Result) 0.0-216.4 sec 7936 KBytes 300 Kbits/sec
(UDP) (Result) 0.0-61.1 sec 2320 KBytes 311 Kbits/sec 36.268 ms
145/1616 (9%)
2. Classes 14, 15, 16 & 17 simultaneous tests
(TCP) (Server) iperf -f k -p 10014 -B 10.1.0.7 -s
(TCP) (Server) iperf -f k -p 10015 -B 10.1.0.7 -s
(TCP) (Server) iperf -f k -p 10016 -B 10.1.0.7 -s
(TCP) (Server) iperf -f k -p 10017 -B 10.1.0.7 -s
(TCP) (Client) iperf -c 10.1.0.7 -p 10014 -f k -t 60 -w 16k & iperf -c
10.1.0.7 -p 10015 -f k -t 60 -w 16k & iperf -c 10.1.0.7 -p 10016 -f k -t 60 -w
16k & iperf -c 10.1.0.7 -p 10017 -f k -t 60 -w 16k
(UDP) (Server) iperf -f k -p 10014 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10015 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10016 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10017 -B 10.1.0.7 -s -u
(UDP) (Client) iperf -c 10.1.0.7 -p 10014 -f k -t 60 -w 16k -u -b 400k &
iperf -c 10.1.0.7 -p 10015 -f k -t 60 -w 16k -u -b 400k & iperf -c 10.1.0.7 -p
10016 -f k -t 60 -w 16k -u -b 400k & iperf -c 10.1.0.7 -p 10017 -f k -t 60 -w
16k -u -b 400k
(Result) Interval Transfer Bandwidth Jitter
Lost/Total Datagrams
(TCP) (Res-14) 0.0-74.9 sec 1024 KBytes 112.0 Kbits/sec
(TCP) (Res-15) 0.0-83.3 sec 768 KBytes 75.6 Kbits/sec
(TCP) (Res-16) 0.0-83.3 sec 768 KBytes 75.5 Kbits/sec
(TCP) (Res-17) 0.0-87.6 sec 512 KBytes 47.9 Kbits/sec
(UDP) (Res-14) 0.0-61.4 sec 876 KBytes 117.0 Kbits/sec 209.105 ms
48/609 (7.9%)
(UDP) (Res-15) 0.0-61.9 sec 589 KBytes 77.8 Kbits/sec 385.135 ms
48/409 (12%)
(UDP) (Res-16) 0.0-62.0 sec 589 KBytes 77.8 Kbits/sec 378.021 ms
48/409 (12%)
(UDP) (Res-17) 0.0-62.9 sec 307 KBytes 40.0 Kbits/sec 1392.421 ms
48/213 (23%)
3. Classes 14, 15, 16 & 17 simultaneous tests (dmax:umax values for clases 16 &
17 have been removed)
(UDP) (Server) iperf -f k -p 10014 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10015 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10016 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10017 -B 10.1.0.7 -s -u
(UDP) (Client) iperf -c 10.1.0.7 -p 10014 -f k -t 60 -w 16k -u -b 400k &
iperf -c 10.1.0.7 -p 10015 -f k -t 60 -w 16k -u -b 400k & iperf -c 10.1.0.7 -p
10016 -f k -t 60 -w 16k -u -b 400k & iperf -c 10.1.0.7 -p 10017 -f k -t 60 -w
16k -u -b 400k
(Result) Interval Transfer Bandwidth Jitter
Lost/Total Datagrams
(UDP) (Res-14) 0.0-61.4 sec 876 KBytes 117.0 Kbits/sec 209.139 ms
48/609 (7.9%)
(UDP) (Res-15) 0.0-61.9 sec 589 KBytes 77.8 Kbits/sec 467.770 ms
48/409 (12%)
(UDP) (Res-16) 0.0-62.0 sec 589 KBytes 77.8 Kbits/sec 378.150 ms
48/409 (12%)
(UDP) (Res-17) 0.0-62.9 sec 307 KBytes 40.0 Kbits/sec 1400.246 ms
48/213 (23%)
4. Classes 14, 15, 16 & 17 simultaneous tests (dmax:umax values for ALL clases
have been removed)
(UDP) (Server) iperf -f k -p 10014 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10015 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10016 -B 10.1.0.7 -s -u
(UDP) (Server) iperf -f k -p 10017 -B 10.1.0.7 -s -u
(UDP) (Client) iperf -c 10.1.0.7 -p 10014 -f k -t 60 -w 16k -u -b 400k &
iperf -c 10.1.0.7 -p 10015 -f k -t 60 -w 16k -u -b 400k & iperf -c 10.1.0.7 -p
10016 -f k -t 60 -w 16k -u -b 400k & iperf -c 10.1.0.7 -p 10017 -f k -t 60 -w
16k -u -b 400k
(Result) Interval Transfer Bandwidth Jitter
Lost/Total Datagrams
(UDP) (Res-14) 0.0-61.4 sec 874 KBytes 117.0 Kbits/sec 199.642 ms
48/608 (7.9%)
(UDP) (Res-15) 0.0-62.0 sec 589 KBytes 77.8 Kbits/sec 338.291 ms
48/409 (12%)
(UDP) (Res-16) 0.0-62.0 sec 589 KBytes 77.8 Kbits/sec 338.802 ms
48/409 (12%)
(UDP) (Res-17) 0.0-62.6 sec 299 KBytes 39.1 Kbits/sec 1334.606 ms
4/212 (1.9%)
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