Haifeng Li | 2 Jun 03:08 2011

Re: Is there any options for tcp like -b

Hi Metod,
 
Thanks very much for your prompt response, My name is 李海峰(Haifeng Li) from China, but I guess the name is "great" because ...?  :-)
 
I have this requirement due to I hope to test a network appliance by various of bandwidth, jusk like 10mbps, 100mbps, 500mpbs pass through it, and observe the system/network performance.
 
 
Regards,
Haifeng
 
 
 
----- Original Message -----
Sent: Tuesday, May 31, 2011 7:00 PM
Subject: Re: [Iperf-users] Is there any options for tcp like -b

Hi,

first the answer: there's no such thing as -b for TCP as far as I know. I may be wrong though.

Out of curiosity: why would you want to test network performance using TCP and with limited requirement for bandwidth? Not that this kind of testing is ilegitimate ...

BTW, it's great name (Haifeng) you've got ...

BR,
  Metod

Haifeng Li je dne 31/05/11 12:20 napisal-a:
Hi All,
 
I'm learning about iperf recently, and I very interested in it.
 
But I have a question, maybe funny :-), I hope to test network performance as a fixed value with tcp, just like "-b" option on udp. Is there any options for tcp like it. 
 
 
Thanks and regards,
Haifeng


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Paul Sherman | 3 Jun 06:37 2011
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Continuous <designatedfile> transmission.. is it possible?

Hi

 

I’m using Iperf (2.0.2) to transmit data over fibre and would like to send a designated text file (-f).

 

I’m sending at 10 and 100 Mbps and would like the link up and active for 30 min+ with a full pipe.  This requires more data than I can put in a text file.

 

Question:  I there a way to get Iperf to loop the data file or to create a continual send of a file I create?

 

Thanks

 

Paul

 

 

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Gary Gatten | 3 Jun 07:10 2011

Re: Continuous <designatedfile> transmission.. is it possible?

Must it be a file? Else it's easy :) You specifically said "text" file, so I don't see the advantage of using a file as input. I needed to do something similar, but I had to use a compressed file to test throughput on a WAN with compression AIC's in the routers... Fortunately a 500MB file was enough for me. I would say large files (if you must use them) with a shell script that loops iperf "sessions". You could overlap them so it's continuous, such that if it takes 60 secs to xfer the file, start iperf A, wait 55 seconds, then start Iperf B, then wait 55 seconds and go to start. This way A and B will always be running.

If you're trying to kill a pipe, disable TCP slow start and/or use UDP, but I don't recall if UDP can read a file.

Also, perhaps use a large binary file; such as a OS update, or complete OS ISO image. Those are nice and big!
 
From: Paul Sherman [mailto:pwsherm <at> telus.net]
Sent: Thursday, June 02, 2011 11:37 PM
To: iperf-users <at> lists.sourceforge.net <iperf-users <at> lists.sourceforge.net>
Subject: [Iperf-users] Continuous <designatedfile> transmission.. is it possible?
 

Hi

 

I’m using Iperf (2.0.2) to transmit data over fibre and would like to send a designated text file (-f).

 

I’m sending at 10 and 100 Mbps and would like the link up and active for 30 min+ with a full pipe.  This requires more data than I can put in a text file.

 

Question:  I there a way to get Iperf to loop the data file or to create a continual send of a file I create?

 

Thanks

 

Paul

 

 

"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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Gary Gatten | 3 Jun 07:43 2011

Re: Continuous <designatedfile> transmission.. is it possible?

Oh, please note that depending on latency and other factors you may have to run multiple iperf sessions with tcp to keep the link saturated, especially once packets get lost. That's another reason I stick with udp when possible, it just blasts packets and doesn't care - good for saturating links / link validation. Easy to test at different packet sizes, rates, etc.
 
From: Gary Gatten [mailto:Ggatten <at> waddell.com]
Sent: Friday, June 03, 2011 12:10 AM
To: 'pwsherm <at> telus.net' <pwsherm <at> telus.net>; 'iperf-users <at> lists.sourceforge.net' <iperf-users <at> lists.sourceforge.net>
Subject: Re: [Iperf-users] Continuous <designatedfile> transmission.. is it possible?
 
Must it be a file? Else it's easy :) You specifically said "text" file, so I don't see the advantage of using a file as input. I needed to do something similar, but I had to use a compressed file to test throughput on a WAN with compression AIC's in the routers... Fortunately a 500MB file was enough for me. I would say large files (if you must use them) with a shell script that loops iperf "sessions". You could overlap them so it's continuous, such that if it takes 60 secs to xfer the file, start iperf A, wait 55 seconds, then start Iperf B, then wait 55 seconds and go to start. This way A and B will always be running.

If you're trying to kill a pipe, disable TCP slow start and/or use UDP, but I don't recall if UDP can read a file.

Also, perhaps use a large binary file; such as a OS update, or complete OS ISO image. Those are nice and big!
 
From: Paul Sherman [mailto:pwsherm <at> telus.net]
Sent: Thursday, June 02, 2011 11:37 PM
To: iperf-users <at> lists.sourceforge.net <iperf-users <at> lists.sourceforge.net>
Subject: [Iperf-users] Continuous <designatedfile> transmission.. is it possible?
 

Hi

 

I’m using Iperf (2.0.2) to transmit data over fibre and would like to send a designated text file (-f).

 

I’m sending at 10 and 100 Mbps and would like the link up and active for 30 min+ with a full pipe.  This requires more data than I can put in a text file.

 

Question:  I there a way to get Iperf to loop the data file or to create a continual send of a file I create?

 

Thanks

 

Paul

 

 

"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."
"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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Rafael Braga | 15 Jun 21:53 2011
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Iperf pre-compiled version

Hi,

      I need to install iperf on a machine I do not have privileges to install software.
      What should I do? Is there any pre-compiled version of iperf?


thank you very much,


--
Rafael Braga

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David J Hay | 21 Jun 20:22 2011

Please help! Unexpected throughput for gigabit

Hi,
 
Newbie here, to iperf and much networking.
 
Have upgraded my pc at home to gigabit adaptor (Intel Pro/1000 MT) and was excited to hook up my laptop and run iperf to see the awesome 10x speed increase ;)
 
With 100 mbps I averaged approx 30,000 Kbits/sec.  When I reran with the gigabit PCI adaptor, I only got up to about 90,000 Kbits/sec.
 
I really need some help figuring out why!  I have checked cables and they are Cat6 or Cat5e.  The router is a high end Netgear (WNDR3700v2) and the lights show green (gigabit).  The laptop connection shows gigabit, as does the pc.  I ran all the tests that come with the desktop adaptor, and they all pass.
 
This is an old PC - 2002 - Dell Dimension 8200.  Can that affect things? 
 
Where should I look now?
 
Please help!!
 
thanks,
 
David
 
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Gary Gatten | 21 Jun 21:14 2011

Re: Please help! Unexpected throughput for gigabit

It COULD be a cable, but more likely CPU/hardware/drivers/TCP tuning, etc.  With “crappy” gear you should be able to get 50% of line speed.  With good 100Mb/s you should get 90% or better, with 1Gb you should get 70% or better.

 

It’s not just about throughput, it’s about pps.  Most devices don’t like high pps rates.

 

Run your tests with UDP, packet size of 1300 bytes, 64K buffer.  Watch your CPU’s.

 

G

 

 

From: David J Hay [mailto:david-n4VkBqa6VF5BDgjK7y7TUQ@public.gmane.org]
Sent: Tuesday, June 21, 2011 1:23 PM
To: iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: [Iperf-users] Please help! Unexpected throughput for gigabit

 

Hi,

 

Newbie here, to iperf and much networking.

 

Have upgraded my pc at home to gigabit adaptor (Intel Pro/1000 MT) and was excited to hook up my laptop and run iperf to see the awesome 10x speed increase ;)

 

With 100 mbps I averaged approx 30,000 Kbits/sec.  When I reran with the gigabit PCI adaptor, I only got up to about 90,000 Kbits/sec.

 

I really need some help figuring out why!  I have checked cables and they are Cat6 or Cat5e.  The router is a high end Netgear (WNDR3700v2) and the lights show green (gigabit).  The laptop connection shows gigabit, as does the pc.  I ran all the tests that come with the desktop adaptor, and they all pass.

 

This is an old PC - 2002 - Dell Dimension 8200.  Can that affect things? 

 

Where should I look now?

 

Please help!!

 

thanks,

 

David

 

"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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Gary Gatten | 21 Jun 21:18 2011

Re: Please help! Unexpected throughput for gigabit

PS: are you really getting 30Mb/s and 90Mb/s, or are those typos?  A 2002 laptop CPU is WAY too weak for Gig speeds, but it should be able to do 80Mb/s no problem.  With TCP you need to run the test for at LEAST a few minutes due to TCP slow start.

 

From: David J Hay [mailto:david-n4VkBqa6VF5BDgjK7y7TUQ@public.gmane.org]
Sent: Tuesday, June 21, 2011 1:23 PM
To: iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: [Iperf-users] Please help! Unexpected throughput for gigabit

 

Hi,

 

Newbie here, to iperf and much networking.

 

Have upgraded my pc at home to gigabit adaptor (Intel Pro/1000 MT) and was excited to hook up my laptop and run iperf to see the awesome 10x speed increase ;)

 

With 100 mbps I averaged approx 30,000 Kbits/sec.  When I reran with the gigabit PCI adaptor, I only got up to about 90,000 Kbits/sec.

 

I really need some help figuring out why!  I have checked cables and they are Cat6 or Cat5e.  The router is a high end Netgear (WNDR3700v2) and the lights show green (gigabit).  The laptop connection shows gigabit, as does the pc.  I ran all the tests that come with the desktop adaptor, and they all pass.

 

This is an old PC - 2002 - Dell Dimension 8200.  Can that affect things? 

 

Where should I look now?

 

Please help!!

 

thanks,

 

David

 

"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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Amir Ancel | 21 Jun 21:02 2011
Picon

Re: Please help! Unexpected throughput for gigabit

What is your command line ?

 
From: David J Hay [mailto:david <at> thehays.com]
Sent: Tuesday, June 21, 2011 09:22 PM
To: iperf-users <at> lists.sourceforge.net <iperf-users <at> lists.sourceforge.net>
Subject: [Iperf-users] Please help! Unexpected throughput for gigabit
 
Hi,
 
Newbie here, to iperf and much networking.
 
Have upgraded my pc at home to gigabit adaptor (Intel Pro/1000 MT) and was excited to hook up my laptop and run iperf to see the awesome 10x speed increase ;)
 
With 100 mbps I averaged approx 30,000 Kbits/sec.  When I reran with the gigabit PCI adaptor, I only got up to about 90,000 Kbits/sec.
 
I really need some help figuring out why!  I have checked cables and they are Cat6 or Cat5e.  The router is a high end Netgear (WNDR3700v2) and the lights show green (gigabit).  The laptop connection shows gigabit, as does the pc.  I ran all the tests that come with the desktop adaptor, and they all pass.
 
This is an old PC - 2002 - Dell Dimension 8200.  Can that affect things? 
 
Where should I look now?
 
Please help!!
 
thanks,
 
David
 
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Jimmy.ElZorkani | 21 Jun 21:54 2011

Re: Please help! Unexpected throughput for gigabit

Are you running this on a Windows machine? If so, XP, Vista, or Win7? Have you tried adjusting the TCP Window Size (Buffer) using the –w command? Try –w 64k or higher.

 

Also, I’m in agreement with Gary. Your CPU processing power will limit your max throughput.

 

Jimmy El Zorkani

 

From: Gary Gatten [mailto:Ggatten-yXAc8zpuVXNBDgjK7y7TUQ@public.gmane.org]
Sent: Tuesday, June 21, 2011 2:19 PM
To: 'David J Hay'; iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [Iperf-users] Please help! Unexpected throughput for gigabit

 

PS: are you really getting 30Mb/s and 90Mb/s, or are those typos?  A 2002 laptop CPU is WAY too weak for Gig speeds, but it should be able to do 80Mb/s no problem.  With TCP you need to run the test for at LEAST a few minutes due to TCP slow start.

 

From: David J Hay [mailto:david-n4VkBqa6VF5BDgjK7y7TUQ@public.gmane.org]
Sent: Tuesday, June 21, 2011 1:23 PM
To: iperf-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: [Iperf-users] Please help! Unexpected throughput for gigabit

 

Hi,

 

Newbie here, to iperf and much networking.

 

Have upgraded my pc at home to gigabit adaptor (Intel Pro/1000 MT) and was excited to hook up my laptop and run iperf to see the awesome 10x speed increase ;)

 

With 100 mbps I averaged approx 30,000 Kbits/sec.  When I reran with the gigabit PCI adaptor, I only got up to about 90,000 Kbits/sec.

 

I really need some help figuring out why!  I have checked cables and they are Cat6 or Cat5e.  The router is a high end Netgear (WNDR3700v2) and the lights show green (gigabit).  The laptop connection shows gigabit, as does the pc.  I ran all the tests that come with the desktop adaptor, and they all pass.

 

This is an old PC - 2002 - Dell Dimension 8200.  Can that affect things? 

 

Where should I look now?

 

Please help!!

 

thanks,

 

David

 

"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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