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FabulaTech Forum USB Solutions USB over Network (Moderators: Andrew, Tim_GaliullinFT, Sergey_Jarovski) Huge delay for some USB tokens Previous topic | Next topic
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hiddenman
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Huge delay for some USB tokens
on: Apr 6th, 2017, 1:59am 		Quote Quote  Modify Modify
Hi guys,
 
Thank you for the great product!
 
Actually, we have a problem with some USB tokens (cryptography keys eToken/ruToken): it takes up to 1 minute to read information from them, not sure why.  We have a good connection between hosts.
 
So when the token is in the local machine, it takes few seconds to read private key from it, when it's on the remote machine, it takes at least 30 seconds).
 
Is it possible to debug/dump  traffic somehow, to find where the delay is?
 
Thank you in advance.
 
 
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Julia_Spee
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Re: Huge delay for some USB tokens
Reply #1 on: Apr 7th, 2017, 4:21am 		Quote Quote  Modify Modify
Hi! Smiley
Thank you very much for your interest to our products!
 
1) The speed depends on device driver. Some devices send a huge number of small packets, and it leads to significant delays.
The size of delay = 1 packet latency * Number_of_packets
We just redirect  all packets to remote side without any compression (concerning USB over Network and USB for Remote Desktop).
Almost all devices work fine, but there can be some exclusions.
 
2) Also it is possible that the software that works with device, has a very small timeout.  
It makes a request to device, doesn't receive a response, makes new request and then do the same thing more than 1,000 times or so, until it receives the response from device in the range of acceptable timeout.
 
Yes, you can monitor USB traffic of virtual port.  
Please download our USB Monitor Pro, install it on virtual side and check the number of packets and delay between them:
 
http://www.fabulatech.com/usb-monitor-pro-download.html
http://www.usb-monitor.com/usb-monitor-pro-help/
 
Please write me to sales@fabulatech.com for extended trial key.
Contact us freely if any issues!
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hiddenman
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Re: Huge delay for some USB tokens
Reply #2 on: Apr 12th, 2017, 6:34am 		Quote Quote  Modify Modify
Hi,
 
Thank you very much for the explanation.
 
  I tried to monitor the remote device (on the virtual side) and got the error, see the screenshots below.
 
https://postimg.org/image/6gnw8qtub/
https://postimg.org/image/nigqau8pf/
 
What's wrong with that?  
 
Thank you.
 
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hiddenman
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Re: Huge delay for some USB tokens
Reply #3 on: Apr 14th, 2017, 5:05am 		Quote Quote  Modify Modify
on Apr 7th, 2017, 4:21am, Julia_Spee wrote:
Hi! Smiley
Thank you very much for your interest to our products!
 
1) The speed depends on device driver. Some devices send a huge number of small packets, and it leads to significant delays.
The size of delay = 1 packet latency * Number_of_packets
We just redirect  all packets to remote side without any compression (concerning USB over Network and USB for Remote Desktop).
Almost all devices work fine, but there can be some exclusions.
 
2) Also it is possible that the software that works with device, has a very small timeout.  
It makes a request to device, doesn't receive a response, makes new request and then do the same thing more than 1,000 times or so, until it receives the response from device in the range of acceptable timeout.
 
Yes, you can monitor USB traffic of virtual port.  
Please download our USB Monitor Pro, install it on virtual side and check the number of packets and delay between them:
 
http://www.fabulatech.com/usb-monitor-pro-download.html
http://www.usb-monitor.com/usb-monitor-pro-help/
 
Please write me to sales@fabulatech.com for extended trial key.
Contact us freely if any issues!

 
Hi,
 
Could you please help.
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Sergey_Jarovski
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Re: Huge delay for some USB tokens
Reply #4 on: Apr 14th, 2017, 6:46am 		Quote Quote  Modify Modify
Hi
As I can see you are redirecting your usb device with help of "USB Redirector" (https://postimg.cc/image/6gnw8qtub/). I would advise you to use our SW for usb device redirection.
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hiddenman
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Re: Huge delay for some USB tokens
Reply #5 on: Apr 14th, 2017, 8:23am 		Quote Quote  Modify Modify
on Apr 14th, 2017, 6:46am, Sergey_Jarovski wrote:
Hi
As I can see you are redirecting your usb device with help of "USB Redirector" (https://postimg.cc/image/6gnw8qtub/). I would advise you to use our SW for usb device redirection.

Ah, yes, sorry Sad  I was trying different software and all of them had the similar problem.  I will try to monitor correctly, thank you.
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