From owner-freebsd-pf@freebsd.org  Tue Oct 11 17:19:59 2016
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From: "Kristof Provost" <kp@FreeBSD.org>
To: "Kamil Choudhury" <Kamil.Choudhury@anserinae.net>
Cc: "freebsd-pf@freebsd.org" <freebsd-pf@freebsd.org>
Subject: Re: Slow NAT on 10.3-RELEASE
Date: Tue, 11 Oct 2016 16:47:47 +0200
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On 11 Oct 2016, at 10:34, Kamil Choudhury wrote:
> I've seen some mention of checksum issues on NAT limiting performance, 
> but that
> seems to have been fixed as of 10.2 in an errata. Have I stumbled upon 
> an actual
> problem, or have I misconfigured something?
>
It’s worth trying the workaround (i.e. disable all checksum offloading 
on your
interfaces).

I’ve had at least one bug report indicating that the checksum patch is 
not 100%
correct, but I’ve not had the time to investigate that in-depth.

What virtualisation system are you using?

Regards,
Kristof