perfSONAR User Q&A and Other Discussion

[Brian Candler <>]

Attached patch bwctl-iperf3.diff.gz adds no_zerocopy option, and with 
this I get the good performance figures from bwctl. Patch is missing 
manpage documentation of this option.

During this testing, I was finding problems with bwctl not starting 
properly - i.e. getting empty test results (example below). Restarting 
bwctld generally seemed to fix it.

Possibly there is some problem with uninitialised variables.  I know 
that my clocks are not properly NTP synced, but they have been reset 
with "ntpdate -u" and are pretty close to each other.

Regards,

Brian.

$ bwctl -x -v -a 2 -c cov-perf-1 -T iperf3
Messages being sent to syslog(user,err)
bwctl: NTP: Status UNSYNC (clock offset problems likely)
bwctl: Using 192.0.2.251 as the address for local sender
bwctl: Using cov-perf-1 as the address for remote receiver
bwctl: Available in-common: iperf nuttcp iperf3
bwctl: Using tool: iperf3
bwctl: Server 'cov-perf-1' accepted test request at time 1417973274.403474
bwctl: Client 'localhost' accepted test request at time 1417973274.403474
bwctl: 15 seconds until test results available

RECEIVER START
bwctl: start_endpoint: 3626962070.002842
bwctl: run_endpoint: receiver: 192.0.2.254
bwctl: run_endpoint: sender: 192.0.2.251
bwctl: run_tool: tester: iperf3
bwctl: run_tool: receiver: 192.0.2.254
bwctl: run_tool: sender: 192.0.2.251
bwctl: start_tool: 3626962072.702455
iperf 3.0.9
Linux cov-perf-1.network.example.com 
2.6.32-504.1.3.el6.aufs.web100.x86_64 #1 SMP Wed Nov 12 16:01:48 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
iperf3: interrupt - the server has terminated
-----------------------------------------------------------
Server listening on 5872
-----------------------------------------------------------

bwctl: remote peer cancelled test
bwctl: stop_tool: 3626962076.407806
bwctl: stop_endpoint: 3626962076.408613

RECEIVER END

SENDER START
bwctl: start_endpoint: 3626962070.004077
bwctl: run_endpoint: receiver: 192.0.2.254
bwctl: run_endpoint: sender: 192.0.2.251
bwctl: run_tool: tester: iperf3
bwctl: run_tool: receiver: 192.0.2.254
bwctl: run_tool: sender: 192.0.2.251
bwctl: start_tool: 3626962074.403644
iperf 3.0.9
Linux bou-perf-1.network.example.com 
2.6.32-504.1.3.el6.aufs.web100.x86_64 #1 SMP Wed Nov 12 16:01:48 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
bwctl: stop_tool: 3626962074.408072
bwctl: stop_endpoint: 3626962076.409385

SENDER END
$ bwctl -x -v -a 2 -c cov-perf-1 -T iperf3
Messages being sent to syslog(user,err)
bwctl: NTP: Status UNSYNC (clock offset problems likely)
bwctl: Using 192.0.2.251 as the address for local sender
bwctl: Using cov-perf-1 as the address for remote receiver
bwctl: Available in-common: iperf nuttcp iperf3
bwctl: Using tool: iperf3
bwctl: Server 'cov-perf-1' accepted test request at time 1417973274.403474
bwctl: Client 'localhost' accepted test request at time 1417973274.403474
bwctl: 15 seconds until test results available

RECEIVER START
bwctl: start_endpoint: 3626962070.002842
bwctl: run_endpoint: receiver: 192.0.2.254
bwctl: run_endpoint: sender: 192.0.2.251
bwctl: run_tool: tester: iperf3
bwctl: run_tool: receiver: 192.0.2.254
bwctl: run_tool: sender: 192.0.2.251
bwctl: start_tool: 3626962072.702455
iperf 3.0.9
Linux cov-perf-1.network.example.com 
2.6.32-504.1.3.el6.aufs.web100.x86_64 #1 SMP Wed Nov 12 16:01:48 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
iperf3: interrupt - the server has terminated
-----------------------------------------------------------
Server listening on 5872
-----------------------------------------------------------

bwctl: remote peer cancelled test
bwctl: stop_tool: 3626962076.407806
bwctl: stop_endpoint: 3626962076.408613

RECEIVER END

SENDER START
bwctl: start_endpoint: 3626962070.004077
bwctl: run_endpoint: receiver: 192.0.2.254
bwctl: run_endpoint: sender: 192.0.2.251
bwctl: run_tool: tester: iperf3
bwctl: run_tool: receiver: 192.0.2.254
bwctl: run_tool: sender: 192.0.2.251
bwctl: start_tool: 3626962074.403644
iperf 3.0.9
Linux bou-perf-1.network.example.com 
2.6.32-504.1.3.el6.aufs.web100.x86_64 #1 SMP Wed Nov 12 16:01:48 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
bwctl: stop_tool: 3626962074.408072
bwctl: stop_endpoint: 3626962076.409385

SENDER END

Attachment: bwctl-iperf3.diff.gz
Description: application/gzip