netdev - Fw: [Bug 218412] New: Low throughput in WireGuard VPN

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Date: Tue, 23 Jan 2024 08:54:22 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: netdev@...r.kernel.org
Subject: Fw: [Bug 218412] New: Low throughput in WireGuard VPN

Begin forwarded message:

Date: Tue, 23 Jan 2024 15:07:14 +0000
From: bugzilla-daemon@...nel.org
To: stephen@...workplumber.org
Subject: [Bug 218412] New: Low throughput in WireGuard VPN

https://bugzilla.kernel.org/show_bug.cgi?id=218412

            Bug ID: 218412
           Summary: Low throughput in WireGuard VPN
           Product: Networking
           Version: 2.5
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Other
          Assignee: stephen@...workplumber.org
          Reporter: wads31566@...il.com
        Regression: No

Created attachment 305758
  --> https://bugzilla.kernel.org/attachment.cgi?id=305758&action=edit  
kernel config

Issue: iperf3 shows low throughput using WireGuard VPN
Host hardware: Intel(R) Xeon(R) Gold 6226R (64 cores), 700GB RAM.
VM configurations: OpenWRT latest stable release, 2 cores from Intel(R) Xeon(R)
Gold 6226R, 128MB RAM.
Network config: Two physical host (same hardware on both, configs in
attachment) connected via Ethernet switch. On host A (IP ends with 33.101)I run
few VMs via libvirt, every VM is endpoint of one of VPN tunnels. On host B (IP
ends with 33.102) I run VPN server, 1 interface with many VPN endpoint peers.
Throughput between A & B is 10Gb/s, the same between VMs and host B (non-VPN
connection).
Detail description: I run different test configurations, for better
understanding I attached all configs and simple  network graph. 
Test 1: I run "iperf3 -s" on host B and run one iperf3 client on VM using as
address destination VPN server IP address "iperf3 -c 10.10.10.56 -b 0 -t 0".
Result: about 3Gb/s.
Test 2: I run two iperf3 servers with different ports "iperf3 -s -p *port
number*" on host B and two iperf3 clients on VM using as address destination
VPN server IP address, but for every client is different port "iperf3 -c
10.10.10.56 -b 0 -t 0 -p *port number*". Result: summary throughput about 3Gb/s
and about 1.5Gb/s
Other tests: Same as Test 2, but with 3,4 and 5 clients. Result: summary
throughput about 3Gb/s and throughput for every client is evenly dividing by
clients' amount.
On B host I use kernel version 6.8.0-1rc compiled from scratch by myself
(kernel config is also attached), on host A is usual Debian 12. Before updating
kernel on host B there also was Debian 12 and here's Debian bug report link for
the same config: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1060912

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