USB Bandwidth problem

[Chadder007]

We have a USB 2.0 scanner that when we scan about 10 pages at a time, it will hang up the scanning program for a few minutes. The CPU usage isn't bad at all at this time, nor is the memory being taken up. I believe it is a USB 2.0 bandwidth problem. Possibly the Scanner is hogging all that it can of the Reserve, also I noticed that Windows XP has a set reserve for each USB hub. There is one at 20 % and the other at 10%. Is there any way that I can change this or even find out which hub I need to move the Scanner to, to get the 20% at least?
We have an onboard NVidia USB 2.0 on the mobo, and an Adaptec USB 2.0 PCI card.

 

[Chadder007]

The PCI card is using Windows XP's drivers BTW.

 

[kranky]

Maybe a place to start is to determine how much data is generated by the scanner before the program hangs. What resolution, how many colors, what is the document size? Figure out how many megabytes are being pumped through the USB port. Link to how to calculate.

I would be surprised if a USB 2.0 port that can do 480 mbits/sec couldn't keep up with scanning.

Could the problem be in the program itself?

 

[Chadder007]

Calculated 33 mb....but this is for one page right?.....this scanner goes through 15 pages in seconds and then the computer sits there waiting for the data to come up into the program.

 

[corkyg]

Sounds like your scanware is using a cache which holds the job until you decide to SAVE or SAVE AS. Look for a way to enlarge that cache if that is the case.

 

[Chadder007]

Couldn't find anywhere that would be a cache size option. Memory is not a problem on the system. The HD wasn't thrashing or anything, CPU use was very little....its just like it was taking a while for the pages to come over. Tried out Adaptec drivers instead of the Windows XP drivers to no avail.

 

[Chadder007]

Found on Canon's website a Firmware update to the scanner and new driver that seems to have fixed the problem. 🙂
It is a DP-6080 BTW.