[netperf-talk] Urgent UDP_Stream question

[Bhavesh Davda]

Hello Dmitry,

A couple of points:

1. Sorry about the confusion. You've got the exact same name as someone I know, but looking at your e-mail signature, I can't imagine the person I know being in a Dutch rock band :)

2. If I understand your question correctly, you're asking why the UDP send side statistics show a high throughput while the receiver side shows low throughput?

That's because most of your packets never reached netserver in the UDP_STREAM test:

Socket Size, bytes      Message Size, bytes     Elapsed Time, secs      Messages        Throughput, 10^6bits/sec
Okay    Errors
112640  65507   60.00   57408   0       501.42
112640          60.00   94              0.82

57408 packets sent, only 94 packets received.


Socket Size, bytes      Message Size, bytes     Elapsed Time, secs      Messages        Throughput, 10^6bits/sec
Okay    Errors
112640  65507   60.00   57232   0       499.88
112640          60.00   143             1.25

57232 packets sent, only 143 packets received.

TCP on the other hand is a reliable protocol, so it'll use mechanisms like retransmits to receive all packets in an established connection.

But I'm sure someone on netperf-talk might be able to better help you root cause those than I.

Thanks

- Bhavesh

________________________________
From: Budko Dmitry [mi.wisp at gmail.com]
Sent: Thursday, November 10, 2011 6:18 AM
To: Bhavesh Davda; netperf-talk at netperf.org
Subject: Re: [netperf-talk] Urgent UDP_Stream question

Hello Bhavesh Davda!
Maybe, but i'm not sure.

Here's some TCP outputs:
Recv Send Socket Size, bytes    Send Socket Size, bytes         Message Size, bytes     Elapsed Time, secs      Throughput, 10^6bits/sec
 87380  16384   16384   60.10   80.95

Recv Send Socket Size, bytes    Send Socket Size, bytes         Message Size, bytes     Elapsed Time, secs      Throughput, 10^6bits/sec
 87380  16384   16384   60.37   89.23

And here's some udp outputs for same config:

Socket Size, bytes      Message Size, bytes     Elapsed Time, secs      Messages        Throughput, 10^6bits/sec
Okay    Errors
112640  65507   60.00   57408   0       501.42
112640          60.00   94              0.82

Socket Size, bytes      Message Size, bytes     Elapsed Time, secs      Messages        Throughput, 10^6bits/sec
Okay    Errors
112640  65507   60.00   57232   0       499.88
112640          60.00   143             1.25

Netserver was ran as "netserver -4 -p 6543" on pc with dualband gigabit router.
Netperf for both UDP and TCP - as "netperf -l 60 -p 6543 -H <server ip>,4 –L <client ip>,4 -t UDP_STREAM". <server ip> - IP adress of embedded device with wifi adapter, <client ip> - IP adress of the PC with router.

Why send throughput on UDP is such high, when recieved is so low? Something with settings, or what? How you can explain that?

10.11.2011 17:08, Bhavesh Davda пишет:
I'm guessing you're the Dmitry I know? :-)

What's up? Perhaps I can help with some basic questions. Please paste the entire outputs of your TCP_STREAM and UDP_STREAM tests.

Cheers

- Bhavesh

(From my iPhone)


On Nov 10, 2011, at 6:02 AM, "Budko Dmitry" <mi.wisp at gmail.com<mailto:mi.wisp at gmail.com>> wrote:

 Hello guys.

I am new to netperf and i have urgent situation.

I have a pc, connected to a netgear wndr3700 wireless dualband gigabit router with 300mb\s wifi, on which i run netserver:
netserver -4 -p 6543
And i hace a device on embedded linux with wifi on which i run netperf for udp stream test:
netperf -l 60 -p 6543 -H <server ip>,4 –L <client ip>,4 -t TCP_STREAM

As a result of such test i have following results:
Socket Size, bytes      Message Size, bytes     Elapsed Time, secs      Messages        Throughput, 10^6bits/sec
Okay    Errors
112640  65507   60.00   71511   0       624.60

On TCP_stream:
 87380  16384   16384   60.03   53.79


What is the problem with UDP stream? What is going wrong?
Please give me a fast answer. This is very urgent. Thanks.



--
Best regards, Dmitry Budko.
tel.: +375-29-8502706
------------
Weesp:
www.weespband.com<http://www.weespband.com>
myspace.com/weespband<http://myspace.com/weespband>
youtube.com/user/weespwilldestroyus<http://youtube.com/user/weespwilldestroyus>
last.fm/music/weesp
twitter.com/weespband<http://twitter.com/weespband>
http://vkontakte.ru/weespband


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--
Best regards, Dmitry Budko.
tel.: +375-29-8502706
------------
Weesp:
www.weespband.com<http://www.weespband.com>
myspace.com/weespband
youtube.com/user/weespwilldestroyus
last.fm/music/weesp
twitter.com/weespband
http://vkontakte.ru/weespband

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