[SOLVED] Bandwidth issue for VMs - PVE as a router/fw

[TwiX]

Hi,

Weird behavior for a Ubuntu Server 24.04 VM.

Download speed ~500 kbps

While a debian 12 VM is able to download at full speed 1000 Mbps.

On PVE host no bandwidth issue, firewall on (nftables), masquarade, ipv4 forwarding activated.

VMs use CPU type = host with numa activated as well.

Seems that this only occurs when we use PVE as a router/fw for VMs. If PVE is not forwarding VM traffic, no pb so far.

On Windows machines, CPU type = host (numa) - download performance is 10 times less than expected but acceptable (100 Mbps).

Iperf3 between VMs is also OK.

Are you aware of that kind of behavior ?


Antoine

 

[TwiX]

I'm suspecting a host issue...

Using nftables instead of iptables could impact performance ?

 

[_gabriel]

what about iperf3 between host and VM ?
in both direction ?

 

[TwiX]

>= 15 Gbps in both directions

 

[_gabriel]

physical host NIC model ?

 

[TwiX]

BCM57502

 

[_gabriel]

https://help.ovhcloud.com/csm/fr-de...?id=kb_article_view&sysparm_article=KB0066097

related:

N

Thread 'Proxmox pfSense - very slow download on OVH Bare Metal Servers'

Oct 15, 2024

Hey guys.

I have a very strange problem. I have 2 bare metal servers from OVH with an identical configuration (at least that's what they looked like during configuration), but when checked carefully, they differ in the network card.

1. Intel Corporation Ethernet Controller E810-XXC
2. Broadcom Inc. and subsidiaries BCM57502 NetXtreme-E 10Gb/25Gb/40Gb/50Gb Ethernet

I have proxmox 8.2.7 and 1 VM pfSense 2.7.2 on each of them.

The problem only concerns the server with card no. 2, the VM with pfSense has a very slow download, about 1% of the upload.
The situation is strange because if...

• nevq
• Replies: 8
• Forum: Proxmox VE: Networking and Firewall

 

[TwiX]

waow
thanks
it is worth a try

 

[TwiX]

That did the trick !
Thanks a lot