[pve-devel] dropped pkts with Qemu on tap interace (RX)

[Stefan Priebe - Profihost AG]

Hello,

happy new year to all!

Currently i'm trying to fix a problem where we have "random" missing
packets.

We're doing an ssh connect from machine a to machine b every 5 minutes
via rsync and ssh.

Sometimes it happens that we get this cron message:
"Connection to 192.168.0.2 closed by remote host.
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]
ssh: connect to host 192.168.0.2 port 22: Connection refused"

The tap devices on the target vm shows dropped RX packages on BOTH tap
interfaces - strangely with the same amount of pkts?

# ifconfig tap317i0; ifconfig tap317i1
tap317i0  Link encap:Ethernet  HWaddr 6e:cb:65:94:bb:bf
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:2238445 errors:0 dropped:13159 overruns:0 frame:0
          TX packets:9655853 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:177991267 (169.7 MiB)  TX bytes:910412749 (868.2 MiB)

tap317i1  Link encap:Ethernet  HWaddr 96:f8:b5:d0:9a:07
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:1516085 errors:0 dropped:13159 overruns:0 frame:0
          TX packets:1446964 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1597564313 (1.4 GiB)  TX bytes:3517734365 (3.2 GiB)

Any ideas how to inspect this issue?

Greets,
Stefan