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Re: [perfsonar-user] bwctl OSX giving strange results


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  • From: "Bruce A. Mah" <>
  • To: , Brian Candler <>
  • Cc: "" <>
  • Subject: Re: [perfsonar-user] bwctl OSX giving strange results
  • Date: Thu, 18 Dec 2014 11:39:35 -0800
  • Organization: Energy Sciences Network
If memory serves me right, Brian Tierney wrote:
>
> Which version of OSX?
>
> There was a new iperf3 release earlier this week that addressed some
> issues with Yosemite:
> http://software.es.net/iperf/news.html#iperf-3-0-10-released
>
> Maybe you could try compiling bwctl with this version, and see if thats
> any better.
>
> Or maybe its a bug. ;)

Well, that was primarily a build fix. Prior to iperf-3.0.10, iperf3
wouldn't build on Yosemite at all. (Although it's somewhat curious
that, if I'm interpreting it correctly, that somehow the MacOS machine
in this output was able to run iperf-3.0.9 under what looks like
Yosemite...perhaps it was compiled on some other OS version?)

I wonder if one of the endpoints was moving rapidly relative to the
other, or whether one of them was deployed close to a singularity and
was suffering from relativistic time dilation. :-)

Bruce.

> On Thu, Dec 18, 2014 at 8:01 AM, Brian Candler
> <
> <mailto:>>
> wrote:
>
> Here's an odd thing I see when running bwctl between a Linux box and
> an OSX box:
>
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-10.00 sec 18.1 MBytes 15.2 Mbits/sec
> sender
> [ 17] 0.00-10.00 sec 1.08 GBytes 926 Mbits/sec
> receiver
>
> You can see that the values reported by the OSX end are ~60 times
> lower than the correct values reported by the Linux end (for the
> same stream/test!) Full output below. It's the same with both IPv6
> and IPv4.
>
> Maybe some sort of integer overflow?
>
> At the OSX end this is bwctl build from homebrew:
> brew install bwctl --with-iperf3
>
> Regards,
>
> Brian Candler.
>
>
>
> [example@cov-perf-1
> ~]$ bwctl -v -x -s
> cov-client-1.network.example.__com
> <http://cov-client-1.network.example.com> -T iperf3
> Messages being sent to syslog(user,err)
> bwctl: Using cov-client-1.network.example.__com
> <http://cov-client-1.network.example.com> as the address for remote
> sender
> bwctl: Using 2001:db8:0:2::254 as the address for local receiver
> bwctl: Available in-common: iperf nuttcp iperf3
> bwctl: Using tool: iperf3
> bwctl: Server 'localhost' accepted test request at time
> 1418918004.512081
> bwctl: Client 'cov-client-1.network.example.__com
> <http://cov-client-1.network.example.com>' accepted test request at
> time 1418918004.512081
> bwctl: 17 seconds until test results available
>
> RECEIVER START
> bwctl: start_endpoint: 3627906798.312744
> bwctl: run_endpoint: receiver: 2001:db8:0:2::254
> bwctl: run_endpoint: sender: 2001:db8:0:64::252
> bwctl: run_tool: tester: iperf3
> bwctl: run_tool: receiver: 2001:db8:0:2::254
> bwctl: run_tool: sender: 2001:db8:0:64::252
> bwctl: start_tool: 3627906801.918425
> iperf 3.0.9
> Linux cov-perf-1.network.example.com
> <http://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
> ------------------------------__-----------------------------
> Server listening on 5133
> ------------------------------__-----------------------------
> Time: Thu, 18 Dec 2014 15:53:24 GMT
> Accepted connection from 2001:db8:0:64::252, port 49592
> Cookie: cov-client-1.network.example.__com.1
> TCP MSS: 1428 (default)
> [ 17] local 2001:db8:0:2::254 port 5133 connected to
> 2001:db8:0:64::252 port 49593
> Starting Test: protocol: TCP, 1 streams, 131072 byte blocks,
> omitting 0 seconds, 10 second test
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-1.00 sec 110 MBytes 923 Mbits/sec
> [ 17] 1.00-2.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 2.00-3.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 3.00-4.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 4.00-5.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 5.00-6.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 6.00-7.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 7.00-8.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 8.00-9.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 9.00-10.00 sec 110 MBytes 926 Mbits/sec
> [ 17] 10.00-10.00 sec 169 KBytes 915 Mbits/sec
> - - - - - - - - - - - - - - - - - - - - - - - - -
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-10.00 sec 18.1 MBytes 15.2 Mbits/sec
> sender
> [ 17] 0.00-10.00 sec 1.08 GBytes 926 Mbits/sec
> receiver
> CPU Utilization: local/receiver 20.4% (1.4%u/19.1%s), remote/sender
> 36.6% (2.7%u/34.0%s)
> bwctl: stop_tool: 3627906814.910821
> bwctl: stop_endpoint: 3627906815.912232
>
> RECEIVER END
>
> SENDER START
> bwctl: start_endpoint: 3627906798.291852
> bwctl: run_endpoint: receiver: 2001:db8:0:2::254
> bwctl: run_endpoint: sender: 2001:db8:0:64::252
> bwctl: run_tool: tester: iperf3
> bwctl: run_tool: receiver: 2001:db8:0:2::254
> bwctl: run_tool: sender: 2001:db8:0:64::252
> bwctl: start_tool: 3627906804.513476
> iperf 3.0.9
> Darwin cov-client-1.network.example.__com
> <http://cov-client-1.network.example.com> 14.0.0 Darwin Kernel
> Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014;
> root:xnu-2782.1.97~2/RELEASE___X86_64 x86_64
> Time: Thu, 18 Dec 2014 15:53:24 GMT
> Connecting to host 2001:db8:0:2::254, port 5133
> Cookie: cov-client-1.network.example.__com.1
> TCP MSS: 1428 (default)
> [ 17] local 2001:db8:0:64::252 port 49593 connected to
> 2001:db8:0:2::254 port 5133
> Starting Test: protocol: TCP, 1 streams, 131072 byte blocks,
> omitting 0 seconds, 10 second test
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-1.00 sec 4.00 MBytes 33.6 Mbits/sec
> [ 17] 1.00-2.00 sec 1.88 MBytes 15.7 Mbits/sec
> [ 17] 2.00-3.00 sec 1.62 MBytes 13.6 Mbits/sec
> [ 17] 3.00-4.00 sec 1.88 MBytes 15.7 Mbits/sec
> [ 17] 4.00-5.00 sec 1.50 MBytes 12.6 Mbits/sec
> [ 17] 5.00-6.00 sec 1.38 MBytes 11.5 Mbits/sec
> [ 17] 6.00-7.00 sec 1.50 MBytes 12.6 Mbits/sec
> [ 17] 7.00-8.00 sec 1.75 MBytes 14.7 Mbits/sec
> [ 17] 8.00-9.00 sec 1.12 MBytes 9.44 Mbits/sec
> [ 17] 9.00-10.00 sec 1.50 MBytes 12.6 Mbits/sec
> - - - - - - - - - - - - - - - - - - - - - - - - -
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-10.00 sec 18.1 MBytes 15.2 Mbits/sec
> sender
> [ 17] 0.00-10.00 sec 1.08 GBytes 926 Mbits/sec
> receiver
> CPU Utilization: local/sender 36.6% (2.7%u/34.0%s), remote/receiver
> 20.4% (1.4%u/19.1%s)
>
> iperf Done.
> bwctl: stop_tool: 3627906814.889140
> bwctl: stop_endpoint: 3627906815.889722
>
> SENDER END
>
> [example@cov-perf-1
> ~]$ bwctl -v -x -s 192.0.2.252 -T iperf3
> Messages being sent to syslog(user,err)
> bwctl: Using 192.0.2.252 as the address for remote sender
> bwctl: Using 192.0.2.254 as the address for local receiver
> bwctl: Available in-common: iperf nuttcp iperf3
> bwctl: Using tool: iperf3
> bwctl: Server 'localhost' accepted test request at time
> 1418918085.798995
> bwctl: Client '192.0.2.252' accepted test request at time
> 1418918085.798995
> bwctl: 15 seconds until test results available
>
> RECEIVER START
> bwctl: start_endpoint: 3627906881.415730
> bwctl: run_endpoint: receiver: 192.0.2.254
> bwctl: run_endpoint: sender: 192.0.2.252
> bwctl: run_tool: tester: iperf3
> bwctl: run_tool: receiver: 192.0.2.254
> bwctl: run_tool: sender: 192.0.2.252
> bwctl: start_tool: 3627906884.105830
> iperf 3.0.9
> Linux cov-perf-1.network.example.com
> <http://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
> ------------------------------__-----------------------------
> Server listening on 5134
> ------------------------------__-----------------------------
> Time: Thu, 18 Dec 2014 15:54:45 GMT
> Accepted connection from 192.0.2.252, port 49598
> Cookie: cov-client-1.network.example.__com.1
> TCP MSS: 1448 (default)
> [ 17] local 192.0.2.254 port 5134 connected to 192.0.2.252 port 49599
> Starting Test: protocol: TCP, 1 streams, 131072 byte blocks,
> omitting 0 seconds, 10 second test
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-1.00 sec 112 MBytes 936 Mbits/sec
> [ 17] 1.00-2.00 sec 112 MBytes 939 Mbits/sec
> [ 17] 2.00-3.00 sec 112 MBytes 939 Mbits/sec
> [ 17] 3.00-4.00 sec 112 MBytes 939 Mbits/sec
> [ 17] 4.00-5.00 sec 112 MBytes 938 Mbits/sec
> [ 17] 5.00-6.00 sec 112 MBytes 940 Mbits/sec
> [ 17] 6.00-7.00 sec 112 MBytes 939 Mbits/sec
> [ 17] 7.00-8.00 sec 112 MBytes 939 Mbits/sec
> [ 17] 8.00-9.00 sec 112 MBytes 939 Mbits/sec
> [ 17] 9.00-10.00 sec 112 MBytes 939 Mbits/sec
> [ 17] 10.00-10.00 sec 153 KBytes 940 Mbits/sec
> - - - - - - - - - - - - - - - - - - - - - - - - -
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-10.00 sec 18.0 MBytes 15.1 Mbits/sec
> sender
> [ 17] 0.00-10.00 sec 1.09 GBytes 939 Mbits/sec
> receiver
> CPU Utilization: local/receiver 22.1% (1.6%u/20.7%s), remote/sender
> 32.8% (2.3%u/30.5%s)
> bwctl: stop_tool: 3627906895.911827
> bwctl: stop_endpoint: 3627906896.912847
>
> RECEIVER END
>
> SENDER START
> bwctl: start_endpoint: 3627906881.393818
> bwctl: run_endpoint: receiver: 192.0.2.254
> bwctl: run_endpoint: sender: 192.0.2.252
> bwctl: run_tool: tester: iperf3
> bwctl: run_tool: receiver: 192.0.2.254
> bwctl: run_tool: sender: 192.0.2.252
> bwctl: start_tool: 3627906885.800336
> iperf 3.0.9
> Darwin cov-client-1.network.example.__com
> <http://cov-client-1.network.example.com> 14.0.0 Darwin Kernel
> Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014;
> root:xnu-2782.1.97~2/RELEASE___X86_64 x86_64
> Time: Thu, 18 Dec 2014 15:54:45 GMT
> Connecting to host 192.0.2.254, port 5134
> Cookie: cov-client-1.network.example.__com.1
> TCP MSS: 1448 (default)
> [ 17] local 192.0.2.252 port 49599 connected to 192.0.2.254 port 5134
> Starting Test: protocol: TCP, 1 streams, 131072 byte blocks,
> omitting 0 seconds, 10 second test
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-1.00 sec 4.38 MBytes 36.7 Mbits/sec
> [ 17] 1.00-2.00 sec 1.38 MBytes 11.5 Mbits/sec
> [ 17] 2.00-3.00 sec 1.38 MBytes 11.5 Mbits/sec
> [ 17] 3.00-4.00 sec 1.25 MBytes 10.5 Mbits/sec
> [ 17] 4.00-5.00 sec 1.75 MBytes 14.7 Mbits/sec
> [ 17] 5.00-6.00 sec 1.62 MBytes 13.6 Mbits/sec
> [ 17] 6.00-7.00 sec 1.62 MBytes 13.6 Mbits/sec
> [ 17] 7.00-8.00 sec 1.62 MBytes 13.6 Mbits/sec
> [ 17] 8.00-9.00 sec 1.62 MBytes 13.6 Mbits/sec
> [ 17] 9.00-10.00 sec 1.38 MBytes 11.5 Mbits/sec
> - - - - - - - - - - - - - - - - - - - - - - - - -
> Test Complete. Summary Results:
> [ ID] Interval Transfer Bandwidth
> [ 17] 0.00-10.00 sec 18.0 MBytes 15.1 Mbits/sec
> sender
> [ 17] 0.00-10.00 sec 1.09 GBytes 939 Mbits/sec
> receiver
> CPU Utilization: local/sender 32.8% (2.3%u/30.5%s), remote/receiver
> 22.1% (1.6%u/20.7%s)
>
> iperf Done.
> bwctl: stop_tool: 3627906895.888968
> bwctl: stop_endpoint: 3627906896.889973
>
> SENDER END
>
>
>
> --
> Brian Tierney, http://www.es.net/tierney
> Energy Sciences Network (ESnet), Berkeley National Lab
> http://fasterdata.es.net
>


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