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USB Bandwidth Variation

 
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George Gilman



Joined: 21 Jul 2021
Posts: 4
Location: Redmond, WA

PostPosted: Thu Jul 22, 2021 5:54 pm    Post subject: USB Bandwidth Variation Reply with quote

Our situation is that we have a Windows 10 PC that uses VirtualBox to host a Fedora 32 virtual. That virtual needs to communicate with a USB device that requires a high bandwidth.

The first thing we tried was using a VirtualBox extension to access the USB port. That worked, but was very slow. It took 20 seconds to transfer a 2 GB file. For reference, transferring the same file to the Windows 10 PC (no virtual involved) took 3 seconds.

We got USB Redirector working and the transfer time was 3 GB, which was great!

But then to double check we went back and tried without USB Redirector and the transfer time was back to 20 seconds as expected. Then we used USB Redirector again and the transfer time was still 20 seconds. We rebooted both the host Windows and guest Fedora machines, but it's still stuck at 20 seconds. Any clues?
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Peter
Site Admin


Joined: 01 Aug 2007
Posts: 653

PostPosted: Fri Jul 23, 2021 10:36 am    Post subject: Reply with quote

Hello George,

Thank you for your question. Are you redirecting a USB storage device (e.g. SSD)?
3 seconds to transfer 2G file may mean that the file was not actually transferred, but was cached by filesystem. It happens when you write a file to USB drive and then immediately read it back. It does not show the real speed.
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