Hi all.
We are facing some network issues on some Windows Server 2003 machines.In
short, network seems to lock up and stops responding even to ping
requests. From TCPdump on the tap interface on the server I only see arp
request to the gateway, without replies. Increased tx overruns on the
some interface too. No errors at all on windows side. Most of the time
we can disable the interface from within windows and re-enable it to
make things work again. Rarely we have to shut down the virtual machine
(Windows reboot does not solve the problem).
The issue appears randomly without apparent relation with server
activity. One server makes a lot of small outbond connections and locks
up about every 12-24 hours. It has two nic defined and only one is
affected (the heaviest loaded). Other servers have just one nic and lock
less often.
We run Qemu-kvm 1.4.0 and latest virtio-win drivers. On the same
host we did run a Linux web server with no issue in months of activity,
with traffic peaks up to 80Mb/s.
Here's is the startup command:
qemu-system-x86_64 -enable-kvm -machine
type=pc,accel=kvm -cpu kvm64 -pidfile /vmstore/vm_pids/solari.pid -rtc
base=localtime -drive file=/vmstore/vm_disks/solari.img,if=virtio -netdev tap,id=nic01,ifname=tap-solaripub,script=pub102-ifup -device virtio-net-pci,netdev=nic01,mac=CE:DA:01:00:17:16 -netdev tap,id=nic02,ifname=tap-solariconsip,script=consip-ifup -device virtio-net-pci,netdev=nic02,mac=CE:DA:01:00:16:16 -vnc :16 -m 4096 -boot c -k it -usbdevice tablet -name solari -daemonize
We tried also the following options without result
,vhost=off,vnet_hdr=on
,ioeventfd=on,event_idx=off
How can we troubleshoot the issue?
Thanks