Re: Chelsio cards, jumbo frames, memory fragmentation and performance in FreeBSD 13.x?

Set it to 4k and move on.  I'm not aware of any efforts in the VM
layer or network stack to make >PAGE_SIZE clusters usable in practical
situations.  Honestly, at this point I wish that we'd just kill them
entirely.

On Fri, Dec 3, 2021 at 12:52 PM John Jasen <jjasen@gmail.com> wrote:
>
> Pretty close to two years ago, we tripped across conditions where heavily
> used FreeBSD 11.x packet-filter firewalls would slow to a crawl and load
> would go crazy.
>
> In a fit of hopefulness with our upgrade to FreeBSD 13.0, I removed the
> hw.cxgbe.largest_rx_cluster settings we put in place -- only to have our
> hardest hit firewall experience high load and plummeting bandwidth within a
> few hours.
>
> So, I have two questions -- is there a better fix for this? Or, is the
> approach to set largest_rx_cluster to 4k and move on?
>
> Thanks in advance!