Hi,

Please CC me, I'm not a subscriber to the list.

Also, please note this could very well be a guest-os problem, but I've
never experienced anything like this before.


I have a Debian unstable 64bit host on an intel S3000 quad core xeon
X3210. Kernel 2.6.22-2-amd64 (debian flavour) KVM46.
My guests are debian32 with 1 cpu and 1GB ram, connected via '-net
nic,macaddr=52:54:00:00:00:xx -net tap' and linux bridging. I'm
running 3 guests at the time.


Sometimes (see below) the machine appears to drop all incoming packets
from the network.
I can see the guest send arp requests, I can see the replies going
back in the bridge/tap interface on the host, but they don't appear on
the guest.

A fix is taking the guest's nic down and up again, using ifconfig.
Rebuilding the bridge on the host does not help.


This appears to happen on combined disk and network IO. I was
uploading data over a ssh connection (via FISH) to a disk on the
guest.
Doing a mild 100Mbit/s icmp flood to the guest does not trip this behavior.

I don't see any logic to the frequency. I can transfer multiple
gigabytes without a problem, or it can happen every few MB or seconds.


I don't think I've experienced this with KVM36 (my previous version),
but certainly with KVM46.


Any help or suggestions would be greatly appreciated.

Kind regards,
Joris

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