The next release of the Linux kernel, 6.6 [will] include the KSMBD in-kernel server for the SMB networking protocol, developed by Samsung’s Namjae Jeon.
it has faced considerable security testing and as a result it is no longer marked as experimental.
It’s compatible with existing Samba configuration files.
But why is KSMBD important? First off, it promises considerable performance gains and better support for modern features such as Remote Direct Memory Access (RDMA)… KSMBD also adds enhanced security, considerably better performance for both single and multi-thread read/write, better stability, and higher compatibility. In the end, hopefully, this KSMBD will also mean easier share setups in Linux without having to jump through the same hoops one must with the traditional Samba setup.
And there will likely be many distros that compile this server as a kernel module and package it separately, so even inclusion in the kernel doesn’t necessarily save you from defaults that don’t fit you well.