Re: Wireguard head of line blocking when CPUs saturate

[Markus Reichelt <ml@mareichelt.com>]

* Toke Høiland-Jørgensen <toke@toke.dk> wrote:

> I'm sending this message to (a) see if anyone else is seeing the same
> kind of stalling, and (b) to get input on whether the explanation
> outlined above seems plausible. And, in the case of affirmative answers
> to both (a) and (b), to hopefully start a discussion on what to do about
> this :)

I don't use a wireguard setup on arm hardware, I am just brainstorming...
Given that you just use one tunnel, how about pinning wireguard to a core
and, more importantly, pin the program that causes the 'fat tcp flow' to
some other core?

What you describe must be a common problem on low performance ARM setups
running wg on openWRT (mikrotik comes to mind), so I'd have a look in that
corner of the internet also ;)

HTH