> On Feb 22, 2021, at 8:51 PM, Steven Shockley
> wrote:
>
> I have OpenBSD 6.8 running on a Dell R210-II acting as a firewall/router. To
> combat bufferbloat I tried implementing FQ-CoDel queueing. The WAN bandwidth
> is advertised as 940 Mbit/sec down and 840 Mbit/sec up.
>
> I've tried adding one or the other of these lines to my pf.conf:
>
> queue outq on $ext_if flows 1024 bandwidth 1024M max 1024M qlimit 1024 default
> or
> queue outq on $ext_if flows 1024 qlimit 1024 default
>
> In both cases, upload speeds drop from ~800 Mbit/sec to < 100 Mbit/sec.
> Changing the 1024M to other values makes little or no difference. To be
> fair, bufferbloat does improve, but that's quite a hit. I'm measuring using
> the dslreports.com speed test via wired ethernet through a Cisco 3750x.
>
> One possible complexity is that the internal interface is tagged VLANs, but
> if it were an MTU issue I'd expect it to affect performance across the board.
>
> Any suggestions? I'm happy to post dmesg/pf.conf/diagrams if they'd help.
> Thanks.
>
Hi, I have a connection with similar bandwidth. I don’t have a solution for
your problem but want to make one suggestion---don’t use a line like your first
one. pf ignores “flows” when the queue also specifies min/max bandwidth, so
you won’t end up using FQ-CoDel. Do something like this instead to get the
benefit of capping upload bandwidth and also using FQ-CoDel:
queue outq_parent on $ext_if bandwidth 760M max 800M
queue outq parent outq_parent bandwidth 760M flows 1024 qlimit 1024 default
I found I had better results capping upload bandwidth at 10% below my
connection’s stated amount (880M in my case).
Best,
Brian
