How to measure the bandwidth from a certain network.

Hi all,
I am trying to measure the BW from a certain network on my nic.
I have used snoop in order to do it.
The problem is I cannot snoop all day long...the snoop is taking resources from the machine.
Is there another way to do this?
tried several tools to measure BW, but none of them gave me the option to distinguish between hosts and networks.
BTW,
In order to measure the toal BW on the nic,
I am using SNMP MIB oids in order to determine how many packets were received and how many were sent. (but this is not what I need)
If you have an idea I will be glad to hear about it..
Thanks!
Tomer.

raw throughput measurement is typically done with a utility like "TTCP" or "IPERF". However even if you use the correct tool, if you are a newbie with network measurement you can make rookie mistakes. The common one I see is using a tool like TTCP with one stream to measure gigabit. You need to create at least a few streams and test with different numbers of streams. This is to better model what multi-streamed applications actually do on the wire to 'fill the pipe'. You then take those individual streams and total their throughput to get a number (and set expectations).
Just as multiple streams make a gigabit interface more efficient, there is a law of dimishing returns. You can see this by running multiple tests and adding in streams until the the total throughput starts to drop off.
This has been my experience with gigabit and TTCP. Nowadays you have 10gig on the scene and probably even larger NICs to come and I've not worked with these as much.
Also keep in mind that you never get 100Mbps on a 10/100 NIC or a full gigabit of throughput on a 10/100/1000 NIC.
The TTCP utility utilizes the "sender/receiver" method. That should work for your NIC on the problem network. Have one machine be a sender and the other a receiver, then swap them around. TTCP is a text based tool, no fancy GUI, just so you know.
and never, ever use applications like "ftp" to "measure" your throughput. Too much over head to get a "raw" reading AND single threaded apps don't fill the pipe as well.
hope that gets you started.

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How to retrieve the values from a table if they differ in Unit of Measure?

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How to measure the baseline of a noisy, pulsed signal

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I am measuring the torque exerted by a large motor on a shaft using a load cell and lever arm. The shaft runs at approx 150 rpm. I have attached a drawing that shows the output I get. This is a test rig.
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drawing of torque signal.gif ‏26 KB

Thanks for the reply. I understand what you are saying. However, I might have to modify my method for measuring the peaks if I choose to implement your idea. I have taken a screenshot of my "peak finder" code and attached it.
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Attachments:
peak_find_screenshot.jpg ‏45 KB

How to determine the bandwidth of a particular frequency in Labview?

Hallo,
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How to measure the size of an object written by myself?

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I want to measure the rotational speed of a shaft, and I have below hardware:
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RobertoBozzolo:
Thansk for your reply. You are right that measure frequency to get the speed is the best way, but it's hard to get the dirction at the same time. You suggest me that "perform two angle measurements to get the sense of rotation", but I'm not sure I catched what you mean about this. I try to understand your opinion like this: distribute the signals to 2 counters, and start 2 tasks, one for frequency, the other for angle which used for deciding the dirction?
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RobertoBozzolo 已写：
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http://www.ni.com/support

How to measure the duration

Hi all
I would like to know how to measure the duration for which the "over temperature" is in on state in the example "Temperature system Demo.vi"
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thanks in advance.
with regards,
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Attachments:
Temperature System Demo.vi ‏49 KB

Hi McFerra,
Find the attach vi that can solve your question..
enjoy..
DoN't FoRgEt To cLiCk KuDoS.....!!!
Greeting from India,
Malhar
Attachments:
Temperature System Demo.vi ‏46 KB

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Attachments:
Acq&Graph Voltage-Int Clkv1.vi ‏190 KB

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Attachments:
Results_Waveforms.doc ‏141 KB

How to measure the bandwidth from a certain network.

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