From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Tokarev <mjt@tls.msk.ru>
Subject: Re: 2.6.35.11 + qemu-kvm 0.14.0 + Windows XP RDP access = unstable
Date: Tue, 08 Mar 2011 10:22:58 +0300
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08.03.2011 09:43, Thomas L=F8cke 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.
>=20
> 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.
>=20
> This is the command used to start the guests:
>=20
> /opt/qemu-0.13.0/bin/qemu-system-x86_64 -name fdacs1sa1_15,
> process=3Dfdacs1sa1_15 \
>     -pidfile /var/run/kvm/15.pid \
>     -drive file=3D/storage_slow_one/fd_acs2_sa2.raw,snapshot=3Doff,if=
=3Dvirtio,media=3Ddisk,cache=3Dnone,format=3Draw,boot=3Don
> \

Slow ;)

>     -monitor unix:/var/run/kvm/15.monitor,server,nowait \
>     -cpu qemu64 \
>     -smp 1 \
>     -m 512 \
>     -k da \
>     -vnc :15 \
>     -rtc base=3Dlocaltime,clock=3Dhost \
>     -tdf \
>     -net nic,macaddr=3Dde:ad:be:ef:00:15,model=3Dvirtio \
>     -net tap,ifname=3Dtap_15,script=3Dno,downscript=3Dno \

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