Re: 2.6.35.11 + qemu-kvm 0.14.0 + Windows XP RDP access = unstable

[Michael Tokarev <mjt@tls.msk.ru>]

08.03.2011 09:43, Thomas Løcke wrote:
> Hey all,

Hello again Thomas! :)

> I have 9 Windows XP guests running on a KVM host. The host is
> Slackware 13.1 x86_64 with kernel 2.6.35.11.
> 
> All the guests are being accessed using the built-in RDP server in
> Windows XP. This worked perfectly with qemu-kvm 0.13.0, but with
> 0.14.0 the connection is dropped every 5-10 minutes.
> 
> This is the command used to start the guests:
> 
> /opt/qemu-0.13.0/bin/qemu-system-x86_64 -name fdacs1sa1_15,
> process=fdacs1sa1_15 \
>     -pidfile /var/run/kvm/15.pid \
>     -drive file=/storage_slow_one/fd_acs2_sa2.raw,snapshot=off,if=virtio,media=disk,cache=none,format=raw,boot=on
> \

Slow ;)

>     -monitor unix:/var/run/kvm/15.monitor,server,nowait \
>     -cpu qemu64 \
>     -smp 1 \
>     -m 512 \
>     -k da \
>     -vnc :15 \
>     -rtc base=localtime,clock=host \
>     -tdf \
>     -net nic,macaddr=de:ad:be:ef:00:15,model=virtio \
>     -net tap,ifname=tap_15,script=no,downscript=no \

Try switching from the obsolete -net tap to current
-netdev syntax.  See docs/qdev-device-use.txt in the
qemu(-kvm) source tarball.  This will be quite a bit
faster too (and it works since at least 0.12).

[]
> Access via the qemu-kvm VNC interface does not experience these
> connection drops. There are no visible errors in the Windows XP
> guests.

That's interesting.  No, I for one haven't seen anything like
you describe, and it'd definitely be useful to find and fix it.
But I haven't used the old -net tap syntax for quite some time
too - i started a test winXP guest now, let's see how it will
work.

/mjt