On Sat, Dec 27, 2008 at 04:12:35PM +0800, fangxiaozhi 00110321 wrote: > > 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? 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-option-increase-outgoing-buffer-size-and-number.patch 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
