Re: [Libusb-devel] Large receive buffer size causes an error?

[Adam N. <a.n...@sh...>]

> Please clarify under which circumstances you experience the problem.
>
> You have so far mentioned:
>
> building libusb from source on Gentoo

This fails with large buffer sizes.  I'll try to get debugging logs to you 
this evening from libusb-pbatard.git.

> running Windows on hardware

This works fine.

> running Windows in VirtualBox (on Gentoo? maybe also on Windows?)

On Gentoo.  This fails.

> It would seem to me that you're reporting a problem with USB in
> Windows in VirtualBox on Linux behaving different from USB in Windows
> on hardware.

Indirectly yes, but given the same problem exists when using libusb natively 
under Linux (i.e. libusb is the common factor in all the failure scenarios) I 
thought this the best place to report it.

It is my expectation that should this prove to be a problem in libusb, fixing 
it will also fix VirtualBox.

> This would be about Linux libusb support. Please provide usbmon logs
> in that case.

I have only briefly checked with Wireshark and VirtualBox (before I realised 
the problem existed under Linux/libusb also), and I could see the device 
returning data, but this never made it back to the application.  I will try to 
send whatever debugging info I can later today.

> I have heard a lot of nonsense failures with VirtualBox so I am
> thoroughly unimpressed by it's capabilities in general and not at all
> surprised if it is the cause of the problem, but let's find out the
> details and I'll try to avoid jumping to a conclusion. :)

I'm not that worried about VirtualBox, my main concern is getting the app 
working natively under Linux - if that results in a VirtualBox fix as well, 
then all the better :-)

Cheers,
Adam.