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Jonathan Rioux
Asked: 2011-12-07 11:31:50 +0800 CST

File transfer - Bandwidth flickering for no reason

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We are experiencing file transfer issues. I try to troubleshoot this problem but it is really hard.

Here is a screenshot I took while transferring a file from my workstation to another server. The screenshot was taken from the workstation (source):

  • The whole graphic was taken during the file transfer, there was no pause on the transfer or anything.

enter image description here

It doesnt stop to flicker like this. And the ETA of the transfer always changes from 10 minutes to an hour or so, and then gets back to 9 minutes, then back to 100 minutes, so on so forth.

Here is the iperf result:

enter image description here

How can I troubleshoot this issue?

performance file-transfer networking bandwidth iperf

2 Answers

  1. Try wireshark on the server and/or the client. I would guess there is a network congestion going on that forces down the sliding window TCP size of your transfers. Are all components connected with rx/tx flow control set to "on"?

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  2. It seems less likely to me that your problem would be a networking issue. I would consider an I/O bottleneck first. Check your server's disk idle time during the transfer and try to find possible interconnections with the drops in your transfer rate.

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