Proxmox 7.1-7 processor type "host" causing network issues in Ubuntu

[UncleSamSwiss]

Possibly related to 100075, but with an Ubuntu guest OS.

I setup multiple Ubuntu 20.04.3 VMs on my new Proxmox system (see below) and had them on processor type "host" and a "virtio" net0.

All those VMs were causing a lot of network issues: probably dropped packets, but I simply saw DNS not being resolved and HTTP connects failing.

Once I changed the processor type to "kvm64", network started to work properly, but now I have a lot of INFO: task dockerd:xxxx blocked for more than 120 seconds even going up to 241 seconds. I had some of those "blocked" messages before, but they were very seldom.

Now, I'm wondering:

1. What the hell is going on?
2. I hoped to have better performance with "host", was I wrong?
3. If "kvm64" is the best option, how do I get around those kernel I/O blocks for up to 4 minutes?
4. Is there something else wrong in my system/configuration?

My system is:

CPU(s)                24 x Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz (2 Sockets)
Kernel Version        Linux 5.13.19-2-pve #1 SMP PVE 5.13.19-4 (Mon, 29 Nov 2021 12:10:09 +0100)
PVE Manager Version   pve-manager/7.1-7/df5740ad

Sorry, if I got something wrong here, I'm pretty new to Proxmox.

 

[itNGO]

Welcome,
which Mainboard, Network-Hardware?
Which drivers did you install in Host, or just stock?
What Disks and Storage are you using?

Plenty of missing information here....

 

[UncleSamSwiss]

I knew it... I'm sorry!

Since I'm working remotely I'll try to answer as good as possible:
- It's a HP ProLiant DL380p Gen8 V2 Storage Server with 2x1TB SAS 7.2K in RAID 1
- I didn't install any additional drivers, just default install from the ISO (via USB stick)
- 4x1 Gb Ethernet (only one used)

If you need additional information, please let me know how I can figure it out remotely (which commands should I execute in Proxmox).

 

[itNGO]

Can you attach syslog from your PVE-Server here please?