High TX-DRP on VM NIC tap<vmid>i0 high after upgrade from 5.3 to 5.4 to 6.3

[AWoelfel]

Hi,

after an update to PROXMOX 6.3 we encounter a huge number of dropped packets on the tap<vmid> interface within all of our PROXMOX hosts.

3 of our 5 hosts are connected to the outside world; namly : kuririn, piccolo and vegeta.
We see espescially high drop rates on the NICs taking care of the internet traffic. Those are VM#211, 212 and 213

I found another Post which might be related : https://forum.proxmox.com/threads/dropped-over-mtu-packet-1501-1500.83087/#post-367334
But we do not have any MTU drop messages within kmesg atm.

Does anybody hav an idea on how to troubleshoot logs and package TX-DRP on virtual tap<vmid> nics?


THX

Alex

root@kuririn:~# netstat -i
Kernel Interface table
Iface      MTU      RX-OK RX-ERR RX-DRP RX-OVR        TX-OK TX-ERR   TX-DRP TX-OVR Flg
eno1      1500   52943267    142      0      0     55313390      0        0      0 BMRU
eno2      1500       6422      0      0      0          148      0        0      0 BMU
ens4f0np  1500  224758929      0   1467      0    490659622      0        0      0 BMRU
ens4f1np  1500 8975834976      0     80      0   7624115993      0        0      0 BMRU
lo       65536   29284594      0      0      0     29284594      0        0      0 LRU
tap211i0  1500   98973187      0      0      0    314978171      0  2285255      0 BMPRU
tap214i0  1500  216428369      0      0      0     81208123      0  1521008      0 BMPRU
vmbr0     1500   22050530      0      0      0     34956844      0        0      0 BMRU

root@piccolo:~# netstat -i
Kernel Interface table
Iface      MTU      RX-OK RX-ERR RX-DRP RX-OVR       TX-OK TX-ERR  TX-DRP  TX-OVR Flg
eno1      1500   48521384    139      0      0    49472107      0       0       0 BMRU
eno2      1500       6401      0      0      0         147      0       0       0 BMU
ens4f0np  1500  190958221      0      0      0   434845408      0       0       0 BMRU
ens4f1np  1500 7975153363      0    454      0  7849168471      0       0       0 BMRU
lo       65536   28786729      0      0      0    28786729      0       0       0 LRU
tap212i0  1500  113576337      0      0      0   146874852      0 5204491       0 BMPRU
tap215i0  1500   55135550      0      0      0    51658417      0 1315592       0 BMPRU
vmbr0     1500    7461499      0      0      0    96061059      0       0       0 BMRU

root@gohan:~# netstat -i
Kernel Interface table
Iface      MTU      RX-OK RX-ERR RX-DRP RX-OVR      TX-OK TX-ERR TX-DRP TX-OVR Flg
eno1      1500   51343372    127      0      0   49828839      0      0      0 BMRU
ens4f0np  1500  383647168      0      0      0  597914869      0      0      0 BMRU
ens4f1np  1500 3173449049      0      0      0 3330177277      0      0      0 BMRU
lo       65536   31483942      0      0      0   31483942      0      0      0 LRU
tap218i0  1500   16827285      0      0      0   14701038      0  29698      0 BMPRU
vmbr0     1500    6008351      0      0      0   27439916      0      0      0 BMRU