Mailing List for the Bandwidth Testing Tool Iperf

Mariusz | 1 Oct 2011 16:39

incorrect jitter summary

Hi,

I urgently need help and I will be grateful for any hint.

I ran iperf in udp mode using this commands:

# iperf -s -u -f k -i 1 
# iperf -c 192.168.0.105 -u -b 68.8k -l 172 -t 60 -f k -i 1 -P 10 -F g711-glos.wav

-P parameter is different for each subsequent analysis

Example of results from server side:

[  3] local 192.168.0.105 port 5001 connected with 192.168.0.100 port 36324
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  0.0- 1.0 sec  8.40 KBytes  68.8 Kbits/sec  0.783 ms    0/   50 (0%)
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  1.0- 2.0 sec  8.40 KBytes  68.8 Kbits/sec  0.367 ms    0/   50 (0%)
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  2.0- 3.0 sec  8.23 KBytes  67.4 Kbits/sec  0.140 ms    0/   49 (0%)
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  3.0- 4.0 sec  8.57 KBytes  70.2 Kbits/sec  0.181 ms    0/   51 (0%)
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  4.0- 5.0 sec  8.40 KBytes  68.8 Kbits/sec  0.240 ms    0/   50 (0%)
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  5.0- 6.0 sec  8.40 KBytes  68.8 Kbits/sec  0.158 ms    0/   50 (0%)
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  6.0- 7.0 sec  8.06 KBytes  66.0 Kbits/sec  0.232 ms    2/   50 (4%)
[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
[  3]  7.0- 8.0 sec  8.40 KBytes  68.8 Kbits/sec  0.433 ms    0/   50 (0%)

(Continue reading)

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Shashank Khanvilkar | 10 Oct 2011 23:43

Option to auto stop UDP traffic when network goes down

Hello,

Thanks for any response in advance.

I would like to know if iperf supports (or planning to support) any mechanism where the sender will automatically detect (using some sort of keep-alives, say) that the network is down and stop pumping in UDP traffic.

Let me know if something like this exists.

Shank

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Gary Gatten | 11 Oct 2011 00:51

Re: Option to auto stop UDP traffic when network goes down

Easy enough to wrap iperf with a script, or run a separate watchdog process.

From: Shashank Khanvilkar [mailto:kaavla <at> gmail.com]
Sent: Monday, October 10, 2011 04:43 PM
To: iperf-users <at> lists.sourceforge.net <iperf-users <at> lists.sourceforge.net>
Subject: [Iperf-users] Option to auto stop UDP traffic when network goes down

Hello,

Thanks for any response in advance.

Let me know if something like this exists.

Shank

"This email is intended to be reviewed by only the intended recipient and may contain information that is privileged and/or confidential. If you are not the intended recipient, you are hereby notified that any review, use, dissemination, disclosure or copying of this email and its attachments, if any, is strictly prohibited. If you have received this email in error, please immediately notify the sender by return email and delete this email from your system."

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Jon Dugan | 11 Oct 2011 01:17

Re: Option to auto stop UDP traffic when network goes down

Excerpts from Shashank Khanvilkar's message of Mon Oct 10 16:43:16 -0500 2011:
> Hello,
> Thanks for any response in advance.
> 
> I would like to know if iperf supports (or planning to support) any
> mechanism where the sender will automatically detect (using some sort of
> keep-alives, say) that the network is down and stop pumping in UDP traffic.
> Let me know if something like this exists.

Well it depends on what you mean.  If the far end host goes down or is
partitioned from the network (it becomes unreachable fro some reason) Iperf
will exit due to the conventional mechanics of using the sockets interface.

For example:  (192.168.1.1 is not reachable from my test host.)

$ iperf -u -c 192.168.1.1
------------------------------------------------------------
Client connecting to 192.168.1.1, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
------------------------------------------------------------
[  3] local 198.124.252.117 port 59240 connected with 192.168.1.1 port 5001
write2 failed: No route to host
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 0.0 sec  1.44 KBytes  1.04 Mbits/sec
[  3] Sent 1 datagrams
read failed: No route to host
[  3] WARNING: did not receive ack of last datagram after 1 tries.

The important bit above is:  "write2 failed: No route to host"

There are other classes of failures that will not get detected, which
something like keep alives would probably help with.  However, there are no
plans at this point to implement a keep alive system in Iperf.

Hope that helps,

Jon

------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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Gary Gatten | 11 Oct 2011 02:38

Re: Option to auto stop UDP traffic when network goes down

It depends where the failure occurs.  I send udp packets to non existent hosts/IP's all the time and iperf
doesn't care.  If the failure is on the iperf host itself it will prolly care

----- Original Message -----
From: Jon Dugan [mailto:jdugan@...]
Sent: Monday, October 10, 2011 06:17 PM
To: iperf-users <iperf-users@...>
Subject: Re: [Iperf-users] Option to auto stop UDP traffic when network goes	down

Excerpts from Shashank Khanvilkar's message of Mon Oct 10 16:43:16 -0500 2011:
> Hello,
> Thanks for any response in advance.
> 
> I would like to know if iperf supports (or planning to support) any
> mechanism where the sender will automatically detect (using some sort of
> keep-alives, say) that the network is down and stop pumping in UDP traffic.
> Let me know if something like this exists.

Well it depends on what you mean.  If the far end host goes down or is
partitioned from the network (it becomes unreachable fro some reason) Iperf
will exit due to the conventional mechanics of using the sockets interface.

For example:  (192.168.1.1 is not reachable from my test host.)

$ iperf -u -c 192.168.1.1
------------------------------------------------------------
Client connecting to 192.168.1.1, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 9.00 KByte (default)
------------------------------------------------------------
[  3] local 198.124.252.117 port 59240 connected with 192.168.1.1 port 5001
write2 failed: No route to host
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 0.0 sec  1.44 KBytes  1.04 Mbits/sec
[  3] Sent 1 datagrams
read failed: No route to host
[  3] WARNING: did not receive ack of last datagram after 1 tries.

The important bit above is:  "write2 failed: No route to host"

There are other classes of failures that will not get detected, which
something like keep alives would probably help with.  However, there are no
plans at this point to implement a keep alive system in Iperf.

Hope that helps,

Jon

------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
_______________________________________________
Iperf-users mailing list
Iperf-users@...
https://lists.sourceforge.net/lists/listinfo/iperf-users

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All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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Jon Dugan | 11 Oct 2011 04:14

Re: Option to auto stop UDP traffic when network goes down

Excerpts from Gary Gatten's message of Mon Oct 10 19:38:50 -0500 2011:
> It depends where the failure occurs.  I send udp packets to non existent hosts/IP's all the time and iperf
doesn't care.  If the failure is on the iperf host itself it will prolly care

I do that all of the time as well, so I should have been more clear.

If Iperf receives ICMP notifications that there is an error at the far end it
will exit.  This is a somewhat big 'if' as it depends on ICMP not being
filtered and on the network being properly configured.  

Jon

------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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jobhunts02 | 16 Oct 2011 14:04

(no subject)

http://www.atlantaredstarfc.com/page.php?id=94

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Deepika Babu | 18 Oct 2011 06:59

read failed : connection refused

hi,

While running the iperf tool i got this errors

read failed : connection refused

write failed : connection refused

pls tell me why it is showing this errors

Thanks & Regards,
K.U Deepika

------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct

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Francesco Misisca | 27 Oct 2011 15:05

Bad performance with iperf but good with robocopy file transfer

Hey,

#1 Quick question :

What is the difference between using iperf and sending packets and using filecopy? I get bad speed sending between 12-64K packets with iperf. Only 5Mbit/s on a local network. But if I copy big files everything goes good or if I add the –w 1MB option. Anyway, I have a case at Microsoft and Vmware and we are troubleshooting why everything goes slowly in our environment. They asked me to do a robocopy of 30.000 small files with filesize 12K. And it goes pretty fast.. so my question is, what is the difference between these two methods in terms of transferring?

#2 Longer question if you have time to read:

We have the last two months troubleshooted why things go slow in the network and we have used iperf to see that we have problems from some Server2008 hosts to other windows servers, but not to Linux server. Its only the send traffic that goes slow, what we have found out so far:

· If I create a virtual machine and send it to vmware, it will performs bad 5Mbit/s

· If vmware creates a machine and sends it to us, it will performs good 500Mbit/s

· If I create a virtual machine it performs bad 5Mbit/s

· The virtual machine vmware created had 8K as default TCP window size and ours has 64K, any comment? Its created from the exact same ISO and the same procedure

· If we turn up the TCP window Size to 1MB it performs good. 500Mbit/s

· Its only towards other windows machines it performs bad, not towards a Linux dist.

· It can receive in 500Mbit/s but only send in 5Mbt/s

· Robocopy goes much faster 50Mbit/s if the files are 12K each and I copy 26.000 files, but I guess small file copies cant go faster

· Regular windows copy from windows t windows goes as fast as Roocopy.

· All machines are clean installs with no firewall or antivirus, just the latest SP and patches.

It feels like we have tested everything with disabling Offload and all those tweaks but Im happy to get some new perspectives

Francesco

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Brice Augustin | 28 Oct 2011 20:55

can't bind to a source port?

Hi all,

I was wondering why there is no option to bind iperf to a specific source port, on the client side?

Thanks,
Brice

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