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Old 09-24-2009, 08:03 AM   #1
JZL240I-U
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Can I mix USB 1.1 and USB 2.0 ports? I.e. use both ehci and uhci drivers?


And have the data transfer rates of both in the same system? Reason is, I have an old system with only USB 1.1hardware but a free bus slot. I want to buy a USB 2.0 card because I need one faster connection. Question is, do the ehci and uhci drivers work in parallel or will it result in collisions? Is a specific sequence in loading the drivers necessary? Is it possible (and sensible) to do this at all?
 
Old 09-24-2009, 02:24 PM   #2
David the H.
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There should be no problems. I've had a similar setup myself in the past and it worked just fine. Your system should detect the usb version automatically and load whichever driver best supports each hardware device.
 
Old 09-25-2009, 01:08 AM   #3
JZL240I-U
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Thanks, I'll try it out then. Since I have to acquire an antenna and other parts to get my wireless connection to the net running, it will take some time until I can report on any success (hopefully), I'll be back then. Thanks till then .
 
Old 09-30-2009, 06:24 AM   #4
JZL240I-U
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Tried it with an USB stick. First I created a file of 1/2 GB with
Code:
dd if=/dev/urandom of=transfer bs=1M count=500
Then I noted the average transfer rates during read and write for USB 1.1 and USB 2.0:
Code:
878.5 kB/s write USB 1.1
808.0 kB/s read  USB 1.1

3.1 MB/s write USB 2.0
7.2 MB/s read  USB 2.0
Works. Thanks again.

P.S.: The stick might not be the answer to a virgin's prayer, but a factor of roughly 4 to 8 in increased speed nicely answers the basic question.

Last edited by JZL240I-U; 09-30-2009 at 06:27 AM.
 
  


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