Re: [SynCE-WindowsMobile5] Re: Updated WM5 patch

Hi all,

On Thursday 20 April 2006 15:29, Ole André Vadla Ravnås wrote:
> Oops, I forgot to mention one little, but important, detail: It is no
> longer necessary to set the MTU, just stick with the default at 1500.
> At least I've not had any issues with it with the latest patch when
> testing against a Qtek 9100 (HTC Wizard) device.
Great improvement! But unfortunately, i only have USB-1 device sticking at 
12MB/s :-)  Though, that the default MTU is now working, is something for me!

I will host the patch on sourceforge until it has entered the official kernel.

regards
voc



>
> Regards,
> Ole André
>
> On 4/20/06, Ole André Vadla Ravnås <oleavr@xxxxxxxxx> wrote:
> > Hi,
> >
> > Here's an updated version of the original WM5 patch. It doesn't yet
> > solve the compatibility problem with some WM5 devices, which is still
> > under investigation.
> >
> > What's new is that performance has been improved from ~150 kB/sec
> > (testing with pcp, with vdccm running without any debug output), to
> > 450-460 kB/sec, which is a 3x performance improvement. This was
> > achieved by fixing a bug in usbnet.c where it doesn't cope with
> > partial frames, so that if one USB transfer contains say 300 bytes of
> > the first RNDIS packet message, and the next transfer contains the
> > rest of it plus say 5 more RNDIS packet messages, they would all just
> > get dropped resulting in multiple re-transmits, and thus a big
> > performance hit.
> > I'm not sure if my fix is the "right" approach, as I'm still quite new
> > to kernel development in general, but at least it's a step in the
> > right direction.
> >
> > There's also much more debug output now, as rndis_host does far more
> > querying when the device is connected, which could prove useful in
> > pinpointing the differences between working and non-working devices.
> >
> > Regards,
> > Ole André
>
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