Re: [Qemu-devel] USB performance Question

[address@hidden]

Streaming media for some reason behaves differently than usb disks, the latter which about always work.
To really test a USB device, is to run a camera on it.

For example a cheap Toucam Pro or such is a good start.
the cameras I am using are bit more exepensive, in the thousands, so you would not be able to get one to try.

Are you willing to give me exact debug instructions?
Such instructions can be reused by other users, so it would not be a one-off  waste.







Arnon Gilboa wrote:

I have just copied 138 MByte (800 files) from a disk-on-key in 75 sec. This is ~14.7Mbit/s, which is more than USB 1.1 full-speed. I have checked it using KVM and WinXP guest. With QEMU only (-no-kvm), it took 130 sec, which is ~8.5 Mbit/sec.

If you can give some info about your USB device (configurations, interfaces, endpoints etc.) and the transfers (isochronous? bulk?) , it would help in solving this issue.

---

From: address@hidden [mailto:address@hidden] On Behalf Of address@hidden
Sent: Sunday, November 25, 2007 5:54 PM
To: address@hidden
Subject: Re: [Qemu-devel] USB performance Question

Thanks Arnon.

USB1 works really great even for complex streaming cameras!
Although it is just very very slow.
As mentioned I only get about 10kbit/s! which is something I dont understand why.
I would have expected 1Mbit/s and could live with that.

If there are any test you want me to do please dont hesitate.

Cant wait for your USB2 implementation.
Great effort!