perfSONAR User Q&A and Other Discussion

[Brian Candler <>]

On 18/12/2014 21:26, Aaron Brown wrote:

Could you try this patch: http://ndb1.internet2.edu/~aaron/bwctl_change_iperf3_exec.patch

It converts iperf3 from a library into an exec call.

I may be able to try this another day (v. busy right now), but I'll point out something else.

Yesterday I put the perfsonar node and the Mac Mini into the production network (with the Mac Mini on the end of a GPON link), and I've enabled only throughput test and ping test (no latency/loss).

The graphs I see are:

* IPv4: reverse throughput and reverse ping only
* IPv6: reverse throughput only

I presume the ping test is using bwping -T ping? However if I do the tests from the command line, they all work fine (see below: all combinations of -c and -s, IPv6 and IPv4)

I'm therefore leaning to the view that it's the core of bwctl itself which is the problem, rather than the external testing tools it invokes. As I say, I don't have time right now to continue investigation and fully understand the code paths. One useful approach might be to run bwctld under valgrind.

Regards,

Brian.

[example@cov-perf-1 ~]$ bwping -c cov-client-1 -T ping
bwping: Using tool: ping
bwping: 21 seconds until test results available

SENDER START
PING 2001:db8:0:64::252(2001:db8:0:64::252) from 2001:db8:0:2::254 : 56 data bytes
64 bytes from 2001:db8:0:64::252: icmp_seq=1 ttl=63 time=0.532 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=2 ttl=63 time=0.451 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=3 ttl=63 time=0.486 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=4 ttl=63 time=0.470 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=5 ttl=63 time=0.460 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=6 ttl=63 time=0.454 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=7 ttl=63 time=0.447 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=8 ttl=63 time=0.490 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=9 ttl=63 time=0.450 ms
64 bytes from 2001:db8:0:64::252: icmp_seq=10 ttl=63 time=0.450 ms

--- 2001:db8:0:64::252 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9000ms
rtt min/avg/max/mdev = 0.447/0.469/0.532/0.025 ms

SENDER END
[example@cov-perf-1 ~]$ bwping -c 192.0.2.252 -T ping
bwping: Using tool: ping
bwping: 21 seconds until test results available

SENDER START
PING 192.0.2.252 (192.0.2.252) from 192.0.2.254 : 56(84) bytes of data.
64 bytes from 192.0.2.252: icmp_seq=1 ttl=63 time=0.451 ms
64 bytes from 192.0.2.252: icmp_seq=2 ttl=63 time=0.497 ms
64 bytes from 192.0.2.252: icmp_seq=3 ttl=63 time=0.436 ms
64 bytes from 192.0.2.252: icmp_seq=4 ttl=63 time=0.434 ms
64 bytes from 192.0.2.252: icmp_seq=5 ttl=63 time=0.411 ms
64 bytes from 192.0.2.252: icmp_seq=6 ttl=63 time=0.419 ms
64 bytes from 192.0.2.252: icmp_seq=7 ttl=63 time=0.443 ms
64 bytes from 192.0.2.252: icmp_seq=8 ttl=63 time=0.442 ms
64 bytes from 192.0.2.252: icmp_seq=9 ttl=63 time=0.441 ms
64 bytes from 192.0.2.252: icmp_seq=10 ttl=63 time=0.428 ms

--- 192.0.2.252 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9000ms
rtt min/avg/max/mdev = 0.411/0.440/0.497/0.025 ms

SENDER END
[example@cov-perf-1 ~]$ bwping -s cov-client-1 -T ping
bwping: Using tool: ping
bwping: 21 seconds until test results available

SENDER START
PING6(56=40+8+8 bytes) 2001:db8:0:64::252 --> 2001:db8:0:2::254
16 bytes from 2001:db8:0:2::254, icmp_seq=0 hlim=63 time=0.327 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=1 hlim=63 time=0.306 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=2 hlim=63 time=0.364 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=3 hlim=63 time=0.347 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=4 hlim=63 time=0.319 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=5 hlim=63 time=0.312 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=6 hlim=63 time=0.405 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=7 hlim=63 time=0.330 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=8 hlim=63 time=0.321 ms
16 bytes from 2001:db8:0:2::254, icmp_seq=9 hlim=63 time=0.381 ms

--- 2001:db8:0:2::254 ping6 statistics ---
10 packets transmitted, 10 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.306/0.341/0.405/0.031 ms

SENDER END
[example@cov-perf-1 ~]$ bwping -s 192.0.2.252 -T ping
bwping: Using tool: ping
bwping: 21 seconds until test results available

SENDER START
PING 192.0.2.254 (192.0.2.254) from 192.0.2.252: 56 data bytes
64 bytes from 192.0.2.254: icmp_seq=0 ttl=63 time=0.286 ms
64 bytes from 192.0.2.254: icmp_seq=1 ttl=63 time=0.413 ms
64 bytes from 192.0.2.254: icmp_seq=2 ttl=63 time=0.439 ms
64 bytes from 192.0.2.254: icmp_seq=3 ttl=63 time=0.297 ms
64 bytes from 192.0.2.254: icmp_seq=4 ttl=63 time=0.298 ms
64 bytes from 192.0.2.254: icmp_seq=5 ttl=63 time=0.324 ms
64 bytes from 192.0.2.254: icmp_seq=6 ttl=63 time=0.372 ms
64 bytes from 192.0.2.254: icmp_seq=7 ttl=63 time=0.362 ms
64 bytes from 192.0.2.254: icmp_seq=8 ttl=63 time=0.353 ms
64 bytes from 192.0.2.254: icmp_seq=9 ttl=63 time=0.298 ms

--- 192.0.2.254 ping statistics ---
10 packets transmitted, 10 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.286/0.344/0.439/0.050 ms

SENDER END
[example@cov-perf-1 ~]$