Re: Avoiding the lagg(4) bottleneck

On Sun, Apr 20, 2025 at 9:49 PM Brett Glass <brett@lariat.net> wrote:
>
> All:
>
> I've been attempting to expand the capacity of the connection
> between a FreeBSD machine and a switch by using the lagg(4) device
> to aggregate two gigabit ports.
>
> Unfortunately, I'm running into a bottleneck. Perhaps due to the
> overhead of the driver, or limits on multithreading, or locks
> within the system, I can't get anywhere near 2 Gbps out of the pair
> of gigabit ports.
>
> The system CPU is barely loaded and has plenty of compute power,
> and each port can saturate when used alone.
>
> Where's the bottleneck, and is there a way to get around it?
> Perhaps using Netgraph rather than lagg(4)? Ideas welcome.
>
> --Brett Glass
>
>

What is your lagg configuration?
How many different ip/port source tuples are involved with your testing?
How are you testing?

There's no known deficiency with FreeBSD's lagg driver.

~Paul

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