Disable CONFIG_IRQSOFF_TRACER for better WireGuard performance

[cyyself]

Describe the bug

Recently, I found the WireGuard Performance on Respbian is much worse than OpenWRT using my wireguard benchmark script. After some investigations, I found the performance was hindered by CONFIG_PREEMPT and CONFIG_IRQSOFF_TRACER, which hindered from ~1.1Gbps to only ~400Mbps. As Raspbian may be used as Desktop OS, we can only turn off CONFIG_IRQSOFF_TRACER. I also found that Debian has not enabled this configuration by default. IMHO such configuration which hindered too much performance should be removed. If we only remove CONFIG_IRQSOFF_TRACER=y but keep CONFIG_PREEMPT=y, we can also see the performance improvements from ~390Mbps to ~680Mbps. You can also see my investigation procedures here.

Steps to reproduce the behaviour

Using my WireGuard benchmark:

sudo apt install wireguard-tools iperf3 git
git clone https://github.com/cyyself/wg-bench.git
cd wg-bench
sudo ./setup-netns.sh
sudo ./benchmark.sh
sudo ./clean-up.sh

Pi 4 should reach ~680Mbps instead of ~390Mbps.

Device (s)

Raspberry Pi 4 Mod. B

System

/etc/rpi-issue:

Raspberry Pi reference 2023-12-11
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 2acf7afcba7d11500313a7b93bb55a2aae20b2d6, stage2

vcgencmd version:

Oct 17 2023 15:39:16 
Copyright (c) 2012 Broadcom
version 30f0c5e4d076da3ab4f341d88e7d505760b93ad7 (clean) (release) (start)

uname -a (self-compiled):

Linux raspberrypi 6.1.68-v8+ #29 SMP PREEMPT Mon Dec 18 22:58:01 CST 2023 aarch64 GNU/Linux

Logs

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Additional context

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