Using -usbdevice host: slows the guest OS down to a crawl
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
kvm (Ubuntu) |
Won't Fix
|
Low
|
Unassigned | ||
qemu (Ubuntu) |
Won't Fix
|
Undecided
|
Unassigned | ||
qemu-kvm (Ubuntu) |
Triaged
|
Low
|
Unassigned |
Bug Description
Binary package hint: kvm
When accessing a USB device on the host, the entire guest OS slows down to a crawl, to the point where mouse navigation becomes impossible. stracing KVM shows many USBDEVFS_BULK ioctls returning -ETIMEDOUT, corresponding to the frequent pauses of the guest.
Despite this, the device actually does work. In my case, it was a 3G modem (which shows up as USB serial ports), and sending even one "AT" command slowed down the entire guest for minutes at a time, but eventually it returned to normal operation.
I believe this affects qemu as well, but I haven't verified it myself. There is at least one independent report at http://
Matt-
Can you still reproduce this in Jaunty?
If so, what command line are you using to launch kvm?
:-Dustin