Bruce A. Mah | 28 Jul 21:03 2014
Picon

iperf-3.0.6 is available


ESnet (Energy Sciences Network) is proud to announce the public
release of iperf-3.0.6.  This version is a maintenance release with a
few bug fixes and enhancements, notably:

* Several problems with the -B option have been fixed.  Also, API
  calls have been added to libiperf to extend this functionality to
  API clients.

* Some portability fixes for OpenBSD and Solaris have been merged from
  the mainline.

More information on changes can be found in the RELEASE_NOTES
file in the source distribution.

iperf3 is a tool for measuring the maximum TCP and UDP performance
along a path, allowing for the tuning of various parameters and
reporting measurements such as throughput, jitter, and datagram packet
loss.

The original iperf was implemented by NLANR / DAST.  Version 3 is a
complete reimplementation, with the goals of a smaller, simpler code
base, and a library that can be used by other programs.  It also adds
new functionality, such as CPU utilization measurements, zero copy TCP
support, and JSON output.  Note that iperf3 clients and servers are
not compatible with, and will not interoperate with, earlier versions
of iperf.

iperf3 is fully supported on Linux, FreeBSD, and MacOS X.  It may run
on other platforms as well, although it has not received the same
(Continue reading)

arrows Himma | 21 Jul 20:58 2014
Picon

Threading

Hi,
This is arrows.
I want to have multiple simultaneous connections from different clients  to a single server using -P in iperf . but first , i am  required to enable threading in the client and the server.
How to do it?

I appreciate your help
Thank you,
Siham
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Freeman (Xiaoguang) Wang | 8 Jul 04:59 2014

Different iperf UDB behaviour on Fedora 14 and 18

Hi

 

We were test iperf UDP and found with old releases like Fedora 14, iperf TX side does not know the limitation of the link and keeps send at a data rage specified by the command line, so at the TX side we observe lots of packet drops. However, with Fedora 18 and above, it seems iperf UDP traffic is self-regulated and automatically find out the best data rate, and the RX side hardly shows any packet drop.

 

Anybody know the reason? It looks we actually ran the same version of iperf 2.0.5 on both systems.

 

Thanks

FRW

 

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Bruce A. Mah | 16 Jun 20:14 2014
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iperf-3.0.5 is available


ESnet (Energy Sciences Network) is proud to announce the public
release of iperf-3.0.5.  This version is a maintenance release with a
few bug fixes and enhancements, notably:

* A timing issue which caused measurement intervals to be wrong with
  TCP tests on lossy networks has been fixed.

* It is now possible to get (most of) the server-side output at
  the client by using the --get-server-output flag.

* A number of bugs with --json output have been fixed.

More information on changes can be found in the RELEASE_NOTES
file in the source distribution.

Note:  An iperf 3.0.4 release was planned and tagged, but not
officially released.

Related project news:

* Project documentation is in the process of being moved from project
  wiki on GitHub to GitHub Pages at this URL:

  http://software.es.net/iperf/

* Source tarballs are now available at:

  http://downloads.es.net/public/iperf/

iperf3 is a tool for measuring the maximum TCP and UDP performance
along a path, allowing for the tuning of various parameters and
reporting measurements such as throughput, jitter, and datagram packet
loss.

The original iperf was implemented by NLANR / DAST.  Version 3 is a
complete reimplementation, with the goals of a smaller, simpler code
base, and a library that can be used by other programs.  It also adds
new functionality, such as CPU utilization measurements, zero copy TCP
support, and JSON output.  Note that iperf3 clients and servers are
not compatible with, and will not interoperate with, earlier versions
of iperf.

iperf3 is fully supported on Linux, FreeBSD, and MacOS X.  It may run
on other platforms as well, although it has not received the same
attention and testing.

The source code for iperf 3.0.5 is available at:

http://downloads.es.net/pub/iperf/iperf-3.0.5.tar.gz

SHA256 hash:

e1e1989985b17a4c03b0fa207004ad164b137e37ab0682fecbf5e93bcaa920a6  iperf-3.0.5.tar.gz

iperf3 is freely-redistributable under a 3-clause BSD license.  More
information can be found in the LICENSING file inside the source
distribution.

Additional documentation for iperf3 can be found at:

http://software.es.net/iperf

More information about iperf3 (including the issue tracker, source
code repository access, and mailing list) can be found on the iperf3
page on GitHub at:

https://github.com/esnet/iperf

The mailing list for iperf3 development is:

iperf-dev@...

To see the list archives or join the mailing list, visit:

http://groups.google.com/group/iperf-dev

Sergey Naumov | 22 Apr 14:30 2014
Picon

Win32 bad UDP handling

Hello.

I noticed in the source code that in Win32 case iperf uses single threaded mode for UDP traffic because 'WIN32 does bad UDP handling so run single threaded' as stated in comments.

Could somebody explain a bit more why it is handled bad? I faced a problem with UDP handling under WinXP for iperf compiled under cygwin (on Win7). On Win7 everything was good, but on WinXP it looks like some race condition happens - sometimes iperf reports traffic and sometimes does not. I've managed to make it work by introducing some if defined(__CYGWIN__) in Listerer.cpp,

but want to know 2 things:
1. What WinXP doos bad with UDP.
2. How performance could be affected by running iperf in single threaded mode.

Thanks,
Sergey Naumov.
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Jeffrey Lane | 18 Apr 04:33 2014

-B binding option not working

I'm running iperf in Ubuntu.  The package seems to be this version:

iperf version 2.0.5 (08 Jul 2010) pthreads

And I'm having problems with testing multiple interfaces.

I have two NICs on my server:

eth0      Link encap:Ethernet  HWaddr 00:30:48:65:5e:0c
          inet addr:10.0.0.123  Bcast:10.0.0.0  Mask:255.255.255.0

eth1      Link encap:Ethernet  HWaddr 00:30:48:65:5e:0d
          inet addr:10.0.0.128  Bcast:10.0.0.0  Mask:255.255.255.0

AND I do not have a default route set (I deleted the default route
just in case it was the thing giving me grief):

ubuntu <at> supermicro:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.0.0        0.0.0.0         255.255.255.0   U     0      0        0 eth1
10.0.0.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0

And I'm running iperf as a server on a target machine who's IP is 10.0.0.1.

Now, when I try to run iperf using -B to bind to a particular interface:
ubuntu <at> supermicro:~$ for x in 123 128; do  iperf -B 10.0.0.$x -c 10.0.0.1; done
------------------------------------------------------------
Client connecting to 10.0.0.1, TCP port 5001
Binding to local address 10.0.0.123
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 10.0.0.123 port 5001 connected with 10.0.0.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.10 GBytes   943 Mbits/sec
------------------------------------------------------------
Client connecting to 10.0.0.1, TCP port 5001
Binding to local address 10.0.0.128
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 10.0.0.128 port 5001 connected with 10.0.0.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.10 GBytes   943 Mbits/sec

iperf is clearly telling me it's binding to each address and
connecting with each address and running the test.

On the server side, I see this:
ubuntu <at> critical-maas:~$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.0.0.1 port 5001 connected with 10.0.0.123 port 5001
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.10 GBytes   941 Mbits/sec
[  5] local 10.0.0.1 port 5001 connected with 10.0.0.128 port 5001
[  5]  0.0-10.0 sec  1.10 GBytes   941 Mbits/sec

So even the server side seems to think it's getting packets from both NICs.

HOWEVER, when I look at netstat back on my test machine, there's a
completely different story:
ubuntu <at> supermicro:~$ netstat -ni
Kernel Interface table
Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0       1500 0       252      0      0 0            61      0
0      0 BMRU
eth1       1500 0    543626      0      0 0       9773123      0
0      0 BMRU
lo        65536 0       151      0      0 0           151      0
0      0 LRU

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Bruce A. Mah | 26 Mar 21:33 2014
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iperf-3.0.3 is available

ESnet (Energy Sciences Network) is proud to announce the public
release of iperf-3.0.3.  This version is a maintenance release with a
few bug fixes and enhancements, notably:

* The structure of the JSON output is more consistent between the
  cases of one stream and multiple streams.

* The example programs once again build correctly.

* A possible buffer overflow related to error output has been fixed.
  (This is not believed to be exploitable.)

More information on changes can be found in the RELEASE_NOTES
file in the source distribution.

iperf3 is a tool for measuring the maximum TCP and UDP performance
along a path, allowing for the tuning of various parameters and
reporting measurements such as throughput, jitter, and datagram packet
loss.

The original iperf was implemented by NLANR / DAST.  Version 3 is a
complete reimplementation, with the goals of a smaller, simpler code
base, and a library that can be used by other programs.  It also adds
new functionality, such as CPU utilization measurements, zero copy TCP
support, and JSON output.  Note that iperf3 clients and servers are
not compatible with, and will not interoperate with, earlier versions
of iperf.

iperf3 is fully supported on Linux, FreeBSD, and MacOS X.  It may run
on other platforms as well, although it has not received the same
attention and testing.

The source code for iperf 3.0.3 is available at:

http://stats.es.net/software/iperf-3.0.3.tar.gz

SHA256 hash:

79daf3e5e5c933b2fc4843d6d21c98d741fe39b33ac05bd7a11c50d321a2f59d
iperf-3.0.3.tar.gz

iperf3 is freely-redistributable under a 3-clause BSD license.  More
information can be found in the LICENSING file inside the source
distribution.

Additional information about iperf3 (including the issue tracker,
source code repository access, and mailing list) can be found on the
iperf3 page on GitHub at:

https://github.com/esnet/iperf

The mailing list for iperf3 development is:

iperf-dev@...

To see the list archives or join the mailing list, visit:

http://groups.google.com/group/iperf-dev

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Varun Sharma | 24 Mar 18:18 2014
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Re: Fwd: Sending rate decrease in TCP bidirectional test .

Hi,
I go through iperf source code. I want to discuss some observation .

In Unidirectional case sending side loop run more iteration as compared to Bidirectional  sending side.Due to this less data
transfer in bidirectional case. Now I does not get reason why it run less iteration whereas time for loop run is same in both cases ? and How this reason affects bidirectional sending side performance ?

Regards
Varun


On Sun, Feb 23, 2014 at 2:02 AM, Sandro Bureca <sbureca-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
Hi,
do you have any kind of iptables or packet filtering mechanism on the machine ?
even if  all traffic is permitted it might affect somehow the tcp flow.
Someone tunes the tcp stack with
ifconfig buffer
and sysctrl

See also:
http://dak1n1.com/blog/7-performance-tuning-intel-10gbe



Kind regards,
Sandro

On 21 February 2014 18:54, Varun Sharma <vsdssd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> With UDP packets It's work fine.
> When I perform tcp bi-directional test for loop back interface (means on
> same machine server and client exists), same decrease in tcp sending side
> happen. Is it mean problem related with TCP/IP stack ?
>
>
> On Thu, Feb 20, 2014 at 11:46 PM, Bob (Robert) McMahon
> <rmcmahon <at> broadcom.com> wrote:
>>
>> It's hard to say without a lot more information (and difficult to debug
>> via email.)  Do you see the same phenomena when using UDP packets?
>>
>>
>>
>> If it's TCP only a next step may be to analyze the tcp flows with
>> something like tcp trace.  http://www.tcptrace.org/
>>
>>
>>
>> Bob
>>
>> From: Varun Sharma [mailto:vsdssd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
>> Sent: Thursday, February 20, 2014 1:45 AM
>> To: Bob (Robert) McMahon
>> Cc: iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org; amira-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org
>> Subject: Re: [Iperf-users] Fwd: Sending rate decrease in TCP bidirectional
>> test .
>>
>>
>>
>>
>>
>> Hi Bob
>>
>> Thanks for reply.
>>
>> I change in iperf as you suggested , but problem still occur. Is there any
>> another setting for overcome this problem ?
>>
>> can you tell me why this happen ?
>>
>>
>>
>> Varun
>>
>>
>>
>> On Thu, Feb 20, 2014 at 11:11 AM, Bob (Robert) McMahon
>> <rmcmahon-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
>>
>> I've had to increase the NUM_REPORT_STRUCTS to get better iperf
>> performance in 2.0.5
>>
>>
>>
>> improved/iperf] $ svn diff include/*.h
>>
>> Index: include/Reporter.h
>>
>> ===================================================================
>>
>> --- include/Reporter.h   (revision 2)
>>
>> +++ include/Reporter.h                (working copy)
>>
>> <at> <at> -61,7 +61,7 <at> <at>
>>
>>
>>
>>  #include "Settings.hpp"
>>
>>
>>
>> -#define NUM_REPORT_STRUCTS 700
>>
>> +#define NUM_REPORT_STRUCTS 7000
>>
>> #define NUM_MULTI_SLOTS    5
>>
>>
>>
>> Bob
>>
>>
>>
>> From: Varun Sharma [mailto:vsdssd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
>> Sent: Wednesday, February 19, 2014 9:15 PM
>> To: iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org; amira-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org
>> Subject: [Iperf-users] Fwd: Sending rate decrease in TCP bidirectional
>> test .
>>
>>
>>
>> Hi,
>>
>> My machine ethtool -i info.
>>
>> driver: mlx4_en
>>
>> version: 2.1.6 (Aug 27 2013)
>> firmware-version: 2.5.0
>> bus-info: 0000:19:00.0
>>
>> Even after applying patch problem still occur. Can you tell me the reason
>> for this why decrease in Sending side happen ?
>>  Is this problem regarding iperf  or TCP/IP stack or nic card ?
>>
>> Regards
>>
>> Varun Sharma
>>
>>
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Amir Ancel <amira-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
>> Date: Wed, Feb 19, 2014 at 2:36 PM
>> Subject: RE: [Iperf-users] Sending rate decrease in TCP bidirectional test
>> .
>> To: Varun Sharma <vsdssd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, "iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org"
>> <iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
>> Cc: Sagi Schlanger <sagis-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
>>
>> Hi Varun,
>>
>>
>>
>> Can you please share your driver and firmware versions using "ethtool -i
>> ethX" ?
>>
>> Also, attached a patch that fixes bidirectional functional issue.
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Amir Ancel
>>
>> Performance and Power Group Manager
>>
>> www.mellanox.com
>>
>>
>>
>> From: Varun Sharma [mailto:vsdssd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]
>> Sent: Wednesday, February 19, 2014 10:44 AM
>> To: iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>> Subject: [Iperf-users] Sending rate decrease in TCP bidirectional test .
>>
>>
>>
>> Hi,
>>
>> I am using iperf v 2.0.5 for testing the Mellanox ConnectX VPI card. Its a
>> dual port 10G card. Two 16 core machines with 64GB RAM are connected back to
>> back.
>>
>> In TCP Bidirectional test case sending throughput decrease as compare to
>> TCP Unidirectional test case sending .
>>
>> All cases use default setting . No extra parameter is set.
>>
>>
>>
>> In case of 4 Client threads Output comes :--
>>
>> Unidirectional Send Process --- 9.6 Gbps
>>
>> Bidirectional Send Process ----  4.9  Gbps
>>
>>
>> In case of 8 Client threads Output comes :--
>>
>> Unidirectional Send Process --- 9.7 Gbps
>>
>> Bidirectional Send Process -- 6.4 Gbps
>>
>>
>> In case of 16 Client threads Output comes :--
>>
>>  Unidirectional Send Process --- 9.7 Gbps
>>
>>  Bidirectional Send Process --    8 Gbps
>>
>> Any reason for this outcome ?
>>
>> Regards
>>
>> Varun
>>
>>
>>
>>
>>
>>
>
>
>
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Damian Lezama | 20 Mar 19:05 2014

iperf tests with many connections

Hi,

I've observed that using many connections (hundreds) with iperf (-P 100 for example) has some issues:
- In links with some latency it takes forever to start testing. This time seems to grow much faster than
linear. For example 20 secs for 50 connections and 100 secs for 100 connections.
- At some point between 100 and 200 connections, iperf stops showing the [SUM] row at the end with the total result

Any ideas?

(the iperf version I have available in this environment is quite old 2.0.4, should I expect this to be fixed
in a newer version?)

Thanks,
Damian

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Bruce A. Mah | 10 Mar 19:16 2014
Picon

iperf3-3.0.2 is available

SPECIAL NOTE: The iperf3 project, including the source code
repository, issue tracker, and wiki, has been moved to GitHub.

ESnet (Energy Sciences Network) is proud to announce the public
release of iperf3 3.0.2.  This version is a maintenance release that
fixes a number of bugs, many reported by users, adds a few minor
enhancements, and tracks the migration of the iperf3 project to
GitHub.  Of particular interest:

* Build / runtime fixes for CentOS 5, MacOS 10.9, and FreeBSD.

* TCP snd_cwnd output on Linux in the default output format.

* libiperf is now built as both a shared and static library; by
  default, the iperf3 binary links to the shared library.

More information on changes can be found in the RELEASE_NOTES
file in the source distribution.

iperf3 is a tool for measuring the maximum TCP and UDP performance
along a path, allowing for the tuning of various parameters and
reporting measurements such as throughput, jitter, and datagram packet
loss.

The original iperf was implemented by NLANR / DAST.  Version 3 is a
complete reimplementation, with the goals of a smaller, simpler code
base, and a library that can be used by other programs.  It also adds
new functionality, such as CPU utilization measurements, zero copy TCP
support, and JSON output.  Note that iperf3 clients and servers are
not compatible with, and will not interoperate with, earlier versions
of iperf.

iperf3 is fully supported on Linux, FreeBSD, and MacOS X.  It may run
on other platforms as well, although it has not received the same
attention and testing.

The source code for iperf 3.0.2 is available at:

http://stats.es.net/software/iperf-3.0.2.tar.gz

SHA256 hash:

3c379360bf40e6ac91dfc508cb43fefafb4739c651d9a8d905a30ec99095b282
iperf-3.0.2.tar.gz

iperf3 is freely-redistributable under a 3-clause BSD license.  More
information can be found in the LICENSING file inside the source
distribution.

Additional information about iperf3 (including the issue tracker,
source code repository access, and mailing list) can be found on the
iperf3 page on GitHub at:

https://github.com/esnet/iperf

The mailing list for iperf3 development is:

iperf-dev@...

To see the list archives or join the mailing list, visit:

http://groups.google.com/group/iperf-dev

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Robert Clove | 26 Feb 09:57 2014
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Change Packet Size

Hi All,


Can anyone please guide me how to change the packet size in iperf.
Please guide thanks in advance.


Regards

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