Re: usbserial device speed?

[Greg KH <greg@xxxxxxxxx>]

On Thu, Jun 07, 2007 at 04:27:11PM +0400, mr@xxxxxxxxxxx wrote:
> Hello,
> 
> I am using a Huawei E220 mobile modem (3G/HSDPA, USB2) with Debian Etch,
> kernel 2.6.18.
> 
> I have set it up as a usbserial device (I have to  do a "modprobe
> usbserial vendor=0x12d1 product=0x1003"). In pppd's configuration I use a
> speed of 460800 and the device name is dev/ttyUSB0.
> 
> The modem works fine but the speed seems limited to about 460 kbps, even
> though under Windows (with the driver that was supplied by the provider,
> Three Ireland) I get about a megabit/s.
> 
> I tried putting in 921600 as the speed but then pppd fails sometimes, and
> when it succeeds the speed is no gtreater than with the usual setting of
> 460800.
> 
> Is there any way to increase the communication speed? If so, what is it?

Use a newer kernel which uses the proper driver for this device instead
of the generic usb-serial driver which is not very fast at all.

thanks,

greg k-h

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