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[SOLVED] packet loss on VM to VM bridge on debian 11 KVM host

Linux Kernel, Network, and Services configuration.
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applied_privacy
Posts: 2
Joined: 2021-10-23 18:52

[SOLVED] packet loss on VM to VM bridge on debian 11 KVM host

#1 Post by applied_privacy »

We have a high (>20%) packet loss and latency (>10ms) between VMs (debian 10 and 11) running on the same KVM hypervisor host (debian 11) on a bridge that connects only virtual interfaces with no physical interface involved. The packet loss takes only place on the red connectivity. All other links that involve physical interfaces are not affected.
The physical interfaces A and B are attached to the bgp-VM via passthru. Interface C is a bridge (br0) and attached to a physical interface.
Interface "D" is only virtual (virbr1) with no physical interfaces attached.
bgp1.png
bgp1.png (22.17 KiB) Viewed 3410 times
https://github.com/appliedprivacy/techn ... s/issues/1

The packet drops start to occur at around 20k packets per second.

We are looking for suggestions on how to further analyze this issue to find the root cause.

thanks!
Last edited by applied_privacy on 2021-10-27 09:55, edited 2 times in total.

applied_privacy
Posts: 2
Joined: 2021-10-23 18:52

Re: packet loss on VM to VM bridge on debian 11 KVM host

#2 Post by applied_privacy »

we got the packet drops down to an neglectable level by using multi-queue virtio-net on the bgp-VM and VM interfaces pointing to the bridge (at the price of significant CPU load).

Code: Select all

<driver name='vhost' queues='8'/>

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