Frank Schuster | 23 Oct 09:31 2009
Picon

IPerf 2.0.8 Dualtest

Hello,

I have done a dualtest with iperf:
On server I execute: iperf -s
And on client: iperf -c <server_ip> -d

The output shows me in addition more bandwidth than my network (100MBit/s) has:
[  5]  0.0-10.0 sec    103 MBytes  86.6 Mbits/sec
[  4]  0.0-10.0 sec    101 MBytes  84.4 Mbits/sec
That is approxiametly 170 MBits/sec and not 100 MBit in maximum.

I searched the web for the problem, but the only reason I found is the window size.
I changed it between 50 kb and 1500 kb on client and server but it has no effect (perhaps 5MBit/s).

Is there an other explaination for my problem?

Regards
Frank
______________________________________________________
GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://movieflat.web.de

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Iperf-users mailing list
(Continue reading)

Frank Schuster | 23 Oct 13:13 2009
Picon

How to calculate the theoretical SCTP value?

Hello,

I have a question what for values and what for a formula is used in the calculation in this document for SCTP?
http://www.openss7.org/sctp_perf.html

I don't understand this, perhaps somebody can help me.

Regards
Frank
_______________________________________________________________
Neu: WEB.DE DSL bis 50.000 kBit/s und 200,- Euro Startguthaben!
http://produkte.web.de/go/02/

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Iperf-users mailing list
Iperf-users@...
https://lists.sourceforge.net/lists/listinfo/iperf-users

Amir Ancel | 25 Oct 08:30 2009
Picon

Re: IPerf 2.0.8 Dualtest

Hi,

A dual test means that you are sending the receiving simultaneously.

Your network is probably "Full Duplex" so the maximum bidirectional bandwidth is 200Mbit ( minus protocol
headers ).

Thanks,

Amir Ancel
Mellanox Performance

-----Original Message-----
From: Frank Schuster [mailto:frank.schuster01@...] 
Sent: Friday, October 23, 2009 9:32 AM
To: iperf-users@...
Subject: [Iperf-users] IPerf 2.0.8 Dualtest

Hello,

I have done a dualtest with iperf:
On server I execute: iperf -s
And on client: iperf -c <server_ip> -d

The output shows me in addition more bandwidth than my network (100MBit/s) has:
[  5]  0.0-10.0 sec    103 MBytes  86.6 Mbits/sec
[  4]  0.0-10.0 sec    101 MBytes  84.4 Mbits/sec
That is approxiametly 170 MBits/sec and not 100 MBit in maximum.

I searched the web for the problem, but the only reason I found is the window size.
(Continue reading)

Owain Davies | 26 Oct 11:12 2009

Re: IPerf 2.0.8 Dualtest

Hi,

100Mbps is a maximum. TCP puts a bit of protocol and processing overhead on it. 86.6Mbps is whit I would
expect from a couple of 100MBps Ethernet cards running on a cheep layer 2 (simple) switch. Try running the
test for longer (to overcome slowstart) or use UDP (which has less over head and no slow start) then number
will be closer to 100mbps.

Slowstart should not be two much of a problem on a LAN as the latency will be quite low.

Also after changing the tcpwindow size you need to restart networking services on both computers for the
change to TCP window to take effect (depending on your stack implementation). Restart the computer if you
are unsure over how to do this.

Regards,

Owain

-----Original Message-----
From: Frank Schuster [mailto:frank.schuster01@...] 
Sent: 23 October 2009 08:32
To: iperf-users@...
Subject: [Iperf-users] IPerf 2.0.8 Dualtest

Hello,

I have done a dualtest with iperf:
On server I execute: iperf -s
And on client: iperf -c <server_ip> -d

The output shows me in addition more bandwidth than my network (100MBit/s) has:
(Continue reading)

Frank Schuster | 27 Oct 09:38 2009
Picon

IPerf 2.0.8 using dual or quad core cpus?

Hello,

I want to know if IPerf using dual or quad core cpus or not?
Is there perhaps an option during the configure to activate multi core cpus?
Or is there an other hardware configuration which brings more performance for IPerf?

The reason is that I want to configure a server in a network, which should receives the request from IPerf-Clients.

Regards
Frank
______________________________________________________
GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://movieflat.web.de

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Iperf-users mailing list
Iperf-users@...
https://lists.sourceforge.net/lists/listinfo/iperf-users

Alfredo Alcantara | 28 Oct 17:43 2009
Picon

Fwd: Error using UDP



Good day,

I'm using iperf version 1.7 for Windows and i'm having a problem with the UDP transmision

with this command on the server

iperf -s -p 5300 -u

and this on the client

iperf -c x.x.x.x -u -p 5300 -b 10m

I am receiving the following error

read falied: Connection reset by peer    x4 times

WARNING: ack of laswt datagram failed after 10 tries
recvfrom failed: Connection reset by peer

I do not now what the problem is, and i need the server to stay up  and listening for iperf connection
If by any chance is a new version of iperf for windows, please let me now

Thanks in advanced and best of regards

Alfredo Alcantara


------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Iperf-users mailing list
Iperf-users@...
https://lists.sourceforge.net/lists/listinfo/iperf-users
Frank Schuster | 29 Oct 15:05 2009
Picon

How iperf works?

Hello,

I want know how iperf works?
I know it based on a client-server-modell but what I don't know is, how it calculate the throughput?
For example:
The client send 10 secs data to the server - how the client know the throughput?
He get no packages from the server, doesn't he? - In spite of the ACKs, or use he the acks?

I don't find any information about this in the web, perhaps anybody can help me?

Best Regards
Frank

______________________________________________________
GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://movieflat.web.de

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Iperf-users mailing list
Iperf-users@...
https://lists.sourceforge.net/lists/listinfo/iperf-users


Gmane