Den 16 maj 2019 19:17 skrev Magnus Isaksson <magnus@vmar.se>:
Hello

@strahil
The packet drops are frequent, every time i run "ip -s link" on the guest there is new dropped packets, on the hosts it says "0" and in oVirt it says "0".

I can run tcpdump on hosts and guests, but i don't know how to capture the dropped packets with tcpdump.

There are no RX or TX errors anywhere, not on hosts, guests or switches.

The connection drops are completely random, sometimes after a few minutes and sometimes after a couple of hours, really hard to narrow down, but this may be some errors in our customers network, they are investigating it now, so i will come back with that issue is it still persists.

@Oliver
I tried this, unfortunately still same result, still dropping packets.

@Darell
I tried increasing the RX and TX buffer on the hosts, but the guests still drop packets.

I am using dual 10G, setup in Active-Backup going to two switches, but the second switch is now turned off during the testing to narrow this down.

I have experienced these types of issues, you know, in general on any platform, when frame sizes don't quite match up. From NIC to switch to router- the whole chain from you to your customer- is that investigated at all?

Another thing to check might be the VM NIC "hardware", whether the issue goes away or changes, if you switch to an "e1000" instead of "virtio", or vice versa?

/K


Regards
Magnus
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