Re: [ISSUE] [CLOSED] linux: tcp congestion and optimizations

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Closed issue by tetsumaki on void-packages repository

https://github.com/void-linux/void-packages/issues/39951

Description:
Hello everyone,

I've been using Void Linux for a long time now, and I found that the kernel was not optimized in an optimal way.

Void Linux uses the following settings:

```ini
net.ipv4.tcp_available_congestion_control = reno
net.core.default_qdisc = pfifo_fast
net.ipv4.tcp_congestion_control = reno
```

Most distributions (Rocky/Arch) use the following settings:

```ini
net.ipv4.tcp_available_congestion_control = cubic bbr
net.core.default_qdisc = fq_codel
net.ipv4.tcp_congestion_control = cubic
```

Alpine use the following settings:

```ini
net.ipv4.tcp_available_congestion_control = reno cubic
net.core.default_qdisc = pfifo_fast
net.ipv4.tcp_congestion_control = cubic
```

I think the best setting though is this (Rocky/Arch):

```ini
net.ipv4.tcp_available_congestion_control = cubic bbr
net.core.default_qdisc = fq_codel
net.ipv4.tcp_congestion_control = cubic
```

BBR is very good, but still in alpha, you have to give the user the choice to apply it.

Whatever happens, the kernel should be optimized, and the user should be allowed to change via sysctl.

The discussion is open (fq/fq_codel/sch_fq/cak, reno/bbr and others optimizations).

My english is not perfect ;)

Some links :
- https://github.com/google/bbr/blob/master/README
- https://wiki.archlinux.org/title/sysctl#Enable_BBR
- https://www.cyberciti.biz/cloud-computing/increase-your-linux-server-internet-speed-with-tcp-bbr-congestion-control/
- https://github.com/systemd/systemd/issues/9725
- https://raw.githubusercontent.com/archlinux/svntogit-packages/packages/linux/trunk/config
- https://raw.githubusercontent.com/void-linux/void-packages/master/srcpkgs/linux5.19/files/x86_64-dotconfig