linux-usb-owner@xxxxxxxxxxxxxxx 写于 2009-11-19 21:51:51:
> Am Donnerstag, 19. November 2009 14:22:44 schrieb zhao.ming9@xxxxxxxxxx:
> > Hi Alan,
> >
> > I have used usb-modem to test upload speed in Linux.but something
puzzled
> > me.
> >
> > at the same place and with same device,upload speed differ from linux
and
> > windows.
> >
> > in linux:
> > upload speed is only 2Mbits/s.
> > in windows:
> > upload speed is about 4.1Mbits/s.
> >
> >
> > I dissectted the usb analyzer log and found some difference between
linux
> > and windows.
> >
> > in linux:
> > one BULK transfer include one pair transaction(PING and
OUT),and
> > transaction OUT only sent 256bytes,so one BULK transfer sent
256bytes.
>
> What you see there is equal to the PPP buffer size. David Miller
> has just accepted a patch that bumps this to 4096 bytes. Could
> you check whether this helps?
>
> Regards
> Oliver
> --
the patch works fine.
thanks!
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