[Qemu-stable] connectivity problem with Windows 7 + heavy network-traffic

[Oliver Francke]

Hi,

I have a couple of reports vom people, where the network-link goes down.
I did some live-migration, and the RTL8139 card was connected again, up 
to the next traffic-burst.
( just cmd, one ftp download + two uploads parallel... let it run for 
couple of minutes until drop...)

No way within windows to recover the card except reboot.

All is fine with qem-1.2.0, I have no problem to make some exceptions 
for these VM's, but cool would
be some possibility to narrow down the problem, which is there in 
qemu-1.3.x up to 1.5.0-rc0.

The host is for example an AMD opteron 6172 ( 24 cores).
Switch is openvswitch-1.9.x, nothing special.

Here my call to qemu:

/usr/local/qemu-1.5.0/bin/qemu-system-x86_64 -usbdevice tablet 
-enable-kvm -daemonize -pidfile /var/run/qemu-server/761.pid -monitor 
unix:/var/run/qemu-server/761.mon,server,nowait -vnc 
unix:/var/run/qemu-server/761.vnc,password -qmp 
unix:/var/run/qemu-server/761.qmp,server,nowait -nodefaults -serial none 
-parallel none -device rtl8139,mac=00:F1:70:00:2F:90,netdev=vlan0d0 
-netdev 
type=tap,id=vlan0d0,ifname=tap761i0d0,script=/etc/fcms/add_if.sh,downscript=/etc/fcms/downscript.sh 
-name 1155823384-4 -m 2048 -vga cirrus -k de -smp sockets=1,cores=2 
-device virtio-blk-pci,drive=virtio0 -drive 
format=raw,file=rbd:1155823384/vm-761-disk-1.rbd:rbd_cache=false,cache=writeback,if=none,id=virtio0,media=disk,index=0 
-drive 
format=raw,file=rbd:1155823384/vm-761-swap-1.rbd:rbd_cache=false,cache=writeback,if=virtio,media=disk,index=1 
-drive if=ide,media=cdrom,id=ide1-cd0 -drive 
if=ide,media=cdrom,id=ide1-cd1 -rtc base=localtime -no-hpet -boot order=dc

No problems whatsoever with all Linux-distros ( running hundreds of 
them). I left out the -rtc and -no-hpet, not any better.

Any comments and help welcome,

Oliver.

--

Oliver Francke

filoo GmbH
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