Re: [Qemu-devel] latest master: major slowdown (something spinning?)

[Michael R. Hines]

Yes, it still happens at that commit string.

Is there a specific test or trace I can provide to help track it down?

- Michael

On 04/10/2013 03:43 AM, Paolo Bonzini wrote:
> Il 09/04/2013 19:43, Michael R. Hines ha scritto:
> > *Here's the commit that causes the problem:*
> >
> > $ git checkout d185c094b404b4ff392b77d1244c0233da7d53bd
> > qemu-char: eliminate busy waiting on can_read returning zero
> Can you stil reproduce it after
>
> commit 1e885b25275fb6763eb947b1e53b2d6911b967a8
> Author: Paolo Bonzini <address@hidden>
> Date:   Mon Apr 8 15:03:15 2013 +0200
>
>      qemu-char: really fix behavior on can_read = 0
>
> ?
>
> Paolo
>
> > *Symptoms:*
> >
> > When the VM boots everything crawls and the host CPU is at 100%,
> > messages are printing extremely slowly on the VM console
> > and the VM is not making any boot progress......... printing kernel
> > messages once a second or so.......
> >
> > Something in QEMU appears to be spinning.
> >
> > Here's my command line:
> >
> > qemu-system-x86_64 -enable-kvm -m 2048 -smp
> > 2,sockets=1,cores=1,threads=1 -nodefconfig -rtc base=utc -no-shutdown
> > disk.img -serial pty -monitor unix:/tmp/devguest,server,nowait -netdev
> > type=tap,vhost=on,id=hostnet0,script=kvmifup.sh,downscript=kvmifdown.sh
> > -device virtio-net-pci,netdev=hostnet0,mac=12:34:36:00:00:02 -usb
> > -device usb-tablet,id=input0  -device
> > virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
> >
> > - Michael Hines