# tcp-cca-const

The fastest as well as the most wicked TCP congestion control "algorithm". There shouldn't be too many people knowing this secret or the world will be ruined.

<b>You need root privilege to run all following commands.</b>

## Build:
```bash
make
insmod tcp_const.ko # Require root privilege
```

## Prerequisites:

For Debian-based distros(Debian/Ubuntu/Linux Mint/Kali,etc):
```bash
apt install build-essential linux-headers-$(uname -r)
```
For Redhat distro(CentOS/RHEL/Fedora/openEuler,etc):
```bash
# If you don't have dnf, use yum instead
dnf groupinstall "Development Tools"
dnf in kernel-devel kernel-headers
```
For Arch Linux:
```bash
pacman -S base-devel linux-headers
```
For OpenSUSE:
```bash
zypper in make automake gcc gcc-c++ kernel-devel kernel-default-devel
```

## Troubleshooting:

If compilation failed and it said the function signature does not match, simply delete those two unnamed parameters in `static void const_main(struct sock *sk,u32,int,const struct rate_sample *rs)`

## Next steps:

You can change the size of constant cwnd for even better performance.
```bash
echo 2000 >/sys/module/tcp_const/parameters/const_cwnd
```

## See also:

https://zhuanlan.zhihu.com/p/555328566