On Mon, 2006-07-24 at 13:06 +0400, Brad Campbell wrote:
> G'day all,
>
> Just a diary note or similar.
>
> I've been playing with skype under win2k under qemu with -kernel-kqemu and
> the alsa audio driver.
>
> 1st. The user-net driver appears to be a problem for skype but the tap driver
> works nicely.
>
> 2nd. I was having awful problems with the audio. The app was reporting
> failures of either the dac or
> adc apparently randomly and when it did work it was rather intermittent.
>
> I noticed that with -usb -usbdevice tablet that qemu sits at about 20% cpu
> usage (on this machine
> which is a Pentium-M 1.2G which idles at 600Mhz) whereas without -usb qemu
> idles completely.
>
> In addition to this, without -usb.. skype works almost perfectly. There is
> the occasional audio
> glitch (as you would expect) but it does everything it is supposed to do
> quite nicely.
>
> I'm using all the latest gear. A 2.6.18-rc2 host kernel, Latest Qemu CVS and
> the -pre9 kernel
> accelerator. Win2k SP4 as a guest with either 256 or 384M of ram depending on
> my mood :)
>
> I'm going to have a dig around in the USB stuff when I get the chance, but
> it's more of a fyi and
> for google that I post it here.
Perhaps tweaking the value of ep_bInterval for the tablet's status
change endpoint would help? The endpoint descriptor for the tablet
currently has this at 3 milliseconds. The hid mouse reports a 10
millisecond polling interval.
excerpt from qemu_tablet_config_descriptor in hw/usb-hid.c:
/* one endpoint (status change endpoint) */
0x07, /* u8 ep_bLength; */
0x05, /* u8 ep_bDescriptorType; Endpoint */
0x81, /* u8 ep_bEndpointAddress; IN Endpoint 1 */
0x03, /* u8 ep_bmAttributes; Interrupt */
0x08, 0x00, /* u16 ep_wMaxPacketSize; */
0x03, /* u8 ep_bInterval; (255ms -- usb 2.0 spec) */
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