Thanks Jeroen. The PCI hub the modem connected to is USB2.0. Is there any way to force it use USB2.0 instead of 1.1?
The comparison between windows and linux are done with the identical environment and conditions. Simon On Wed, 16 Feb 2005 22:55:35 +0100, Jeroen Vreeken <[EMAIL PROTECTED]> wrote: > Simon Wu wrote: > > >Hello, > > > >I have a wireless test mobile/modem, which uses usbserial generic > >driver. It shows up on the /proc/bus/usb/devices file a Ver=1.10, > >although the USB PCI hub I used is 2.0. The USB hub driver used is > >ohci_hcd. > > > >I can start ppp and ftp on this modem but the throughput is only 400k. > >However, on windows, it can achieve 1.2M. I played with TCP window > >size without help. > > > >Can any one let me know if USB1.1 device can only go up to 400k? How > >can I improve in my case? > > > > > It can go up higher, but 1.2M is very close the the absolute maximum. > A bit to close for me, are you sure the measurement is correct? > Are you using the same kind of data and connection? > > If it really is such a difference the usbserial driver might not be > optimized for such high speeds (such as issuing multiple urbs). > > Jeroen > > ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
