Re: Updated WM5 patch

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.

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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