[Qemu-devel] USB Asynchronous I/O

[Salil Bijur]

Hello,

I've been testing Bluetooth-USB in QEMU for an arm-based processor
with a Linux guest.

When a bluetooth dongle is added, there is a continuous sending of
bulk and interrupt packets synchronously (using the USBDEVFS_BULK
ioctl) making qemu extremely slow and unusable.
I wanted to know if it is a good idea to send these bulk and interrupt
transfers asynchronously using the SUBMITURB and REAPURBNDELAY ioctls
in a way similar as isochronous transfers in usb-linux.c.
Is there any reason why only isochronous packets are being sent
asynchronously when the same can be done for other types?

Thanks,
Salil