Re: Loss of network connectivity with high load

[Thomas Besser <thomas.besser@kit.edu>]

Hi all,

Daniel Bareiro wrote:
> On Wednesday, 16 June 2010 17:14:54 +0300,
> Avi Kivity wrote:
>>> I'm using Linux 2.6.31.13 compiled with the kernel.org source code on
>>> KVM host with Debian GNU/Linux Lenny amd64. Also I'm using Debian
>>> GNU/Linux Lenny amd64 virtual machine with kernel 2.6.26-2 from
>>> Debian repositories. I'm using qemu-kvm 0.12.3.
> 
>> 2.6.26 is really old.  Can you try a new kernel in the guest?  Recent
>> kernels had many virtio fixes.
> 
> I tested with Linux 2.6.32-bpo.5-amd64 from backports repositories and
> so far I didn't have a problem. If the problem persists, I will comment
> to the list.

I think we have the same problem here: after about 3 GB of transfered data 
with rsync, network (virtio) in the guest stops working (restart of network 
solves the network stop). 

Both host and guest Debian Lenny with 2.6.32. qemu-kvm is version 0.12.4. 
Will try 2.6.34 in guest and report, if the problem still exists. 

Guest starting options:

/usr/bin/kvm -name sysimager -vnc :35 -usbdevice tablet -net 
nic,vlan=0,model=virtio,macaddr=00:08:15:00:09:95 -net 
tap,vlan=0,ifname=tap35,script=no -m 512 -monitor 
unix:/var/run/kvm/sysimager,server,nowait -drive 
index=0,media=disk,file=/vm/sysimager/sysimager.raw,if=virtio,boot=on -drive 
index=1,media=disk,file=/vm/sysimager/daten.raw,if=virtio -daemonize -vga 
std -k de -pidfile /var/run/kvm/sysimager.pid -tdf

No error messages in /var/log/syslog, but via vnc on console. Any hint how 
to copy and paste via vncviewer the message?

Regards
Thomas