Dear Greg:
 
    I have the upload speed problems about the data card modem.
 
    For the data card modem we used, it can support the upload speed up to 5.76Mbps and download speed up to 7.2Mbps on the Windows OS.
 
    And on the Linux OS, such as OpenSuse or Debian, we load the kernel usb serial driver "option.c" for the modem, and  we can get the download speed up to 7.2Mbps.
    But no matter what we do, the upload speed will still be 1.5Mbps, but not 5.76Mbps. And I don't know why it is 1.5Mbps, but not 5.76.
 
    Can you help me to find what results in this?
 
    Thanks very much.
 
Best Regards,
 
Franko Fang
2008-12-27

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It is because no one ever actually tried to make it faster.  I recently
added a patch to my queue to be included in 2.6.29 to do just this, it
can be found at:
	http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-04-usb/usb-opti...

If you could try that out and let me know if you can reach the maximum
speed of your device, I would appreciate it.

thanks,

greg k-h
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HI fangxiaozhi,

How do measured exact upload/downlink speed ? Few days back, I tried
to measure it from command line for USB modems, and had to use only
wget.
Are you following/using any other tool?

Thanks and Regards,
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You also might want to also try 'netperf' as it can measure lots of good
network statistics:
	http://www.netperf.org/netperf/NetperfPage.html

thanks,

greg k-h
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