perfSONAR User Q&A and Other Discussion

["Koch, Brian" <>]

sys-its-70vlk81 ~]# web100clt -l -n 129.120.255.107
Testing network path for configuration and performance problems  --  Using 
IPv4 address
Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done
checking for firewalls . . . . . . . . . . . . . . . . . . .  Failed to 
connect: No route to host
No sockets could be created that match requirements.
Done
running 10s outbound test (client to server) . . . . .  1049.25 Mb/s
running 10s inbound test (server to client) . . . . . . 1132.42 Mb/s
sending meta information to server . . . . . Done
The slowest link in the end-to-end path is a 2.4 Gbps OC-48 subnet
Information: Other network traffic is congesting the link
Server '129.120.255.107' is probably behind a firewall. [Connection to the 
ephemeral port failed]
Client is probably behind a firewall. [Connection to the ephemeral port 
failed]

        ------  Web100 Detailed Analysis  ------

Web100 reports the Round trip time = 9.06 msec;the Packet size = 1448 Bytes; 
and
There were 1781 packets retransmitted, 6271 duplicate acks received, and 
10121 SACK blocks received
Packets arrived out-of-order 1.36% of the time.
This connection is sender limited 96.83% of the time.
This connection is network limited 3.08% of the time.

    Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: ON
RFC 1323 Window Scaling: ON; Scaling Factors - Server=10, Client=10
The theoretical network limit is 311.75 Mbps
The NDT server has a 5971 KByte buffer which limits the throughput to 5149.34 
Mbps
Your PC/Workstation has a 3770 KByte buffer which limits the throughput to 
3251.25 Mbps
The network based flow control limits the throughput to 1884.12 Mbps

Client Data reports link is '  8', Client Acks report link is '  8'
Server Data reports link is '  9', Server Acks report link is '  9'
Packet size is preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Server's 
IP address
        Server says [::ffff:129.120.255.107] but Client says [ 
129.120.255.107]
Information: Network Address Translation (NAT) box is modifying the Client's 
IP address
        Server says [::ffff:10.3.254.5] but Client says [ 10.3.254.5]

-----Original Message-----
From: 

 
[mailto:]
 On Behalf Of Alan Whinery
Sent: Friday, May 02, 2014 4:10 PM
To: 

Subject: Re: [perfsonar-user] bwctl speed questions

Brian  T. - Yes, he said there was a firewall.

Brian Koch,

If NDT is enabled as a service on the target host, can you do

web100clt -l -n <targethost>

and send the results?

Note: if you are sanitizing, the IP target's name or IP appears once in the 
output.



On 5/2/2014 11:04 AM, Brian Tierney wrote:
> With 909 retransmits, you will never get much about 1Gbps.
>
> How "full" is that path? Is there a firewall on the path? Also look at 
> errors on all your router / switch interfaces.
> There may be a dirty fiber.
>
>
>
>
> On Fri, May 2, 2014 at 1:52 PM, Koch, Brian 
> <>
>  wrote:
>> Latency shows ~0.7ms with 0% loss.
>>
>> -----Original Message-----
>> From: Brian Tierney 
>> [mailto:]
>> Sent: Friday, May 02, 2014 3:35 PM
>> Cc: Koch, Brian; 
>> 
>> Subject: Re: [perfsonar-user] bwctl speed questions
>>
>> Brian: What latency is the path you are testing? Does owamp show any 
>> packet loss on that path?
>>
>> Try doing a test with iperf3, which will give you TCP retransmit  count.
>>
>> bwctl -c hostname -I iperf3 -i1 -fm -x -t20
>>
>>
>>
>>
>> On Fri, May 2, 2014 at 7:47 AM, Aaron Brown 
>> <>
>>  wrote:
>>> Hey Brian,
>>>
>>> Unfortunately, there’s not a way to do multiple streams currently. The 
>>> idea was to show how single stream performance looked since any network 
>>> can be made to look good with enough streams :) The next version of the 
>>> Toolkit should include the ability to configure number of streams, 
>>> however.
>>>
>>> Cheers,
>>> Aaron
>>>
>>> On May 2, 2014, at 10:04 AM, 
>>> 
>>>  wrote:
>>>
>>>> Is there a way to run multiple data streams? I'm not sure why the 
>>>> data path is fully tested.
>>>> Connections:
>>>> Perfsonar --> core router (10G)
>>>> core router --> firewall (10G) (fw throughput = 2G) firewall --> 
>>>> outside WAN router (10G) outside WAN router --> perfsonar (10G)
>>>>
>>>> Theoretically, I should be seeing close to 2Gbps on my bwctl 
>>>> graphs, but graphs are barely showing over 1Gbps.
>>>>
>>>> Are there some settings I need to tweak? I'm a little new to this.
>>
>>
>> --
>> Brian Tierney, http://www.es.net/tierney
>>
>> Energy Sciences Network (ESnet), Berkeley National Lab
>>
>> http://fasterdata.es.net
>
>