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From: Mark Felder <feld@FreeBSD.org>
To: Colin Percival <cperciva@freebsd.org>, freebsd-xen@freebsd.org
Cc: gnn@freebsd.org, Kristof Provost <kp@FreeBSD.org>
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Subject: Re: Networking under Xen
Date: Tue, 14 Jul 2015 14:23:00 -0500
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On Tue, Jul 14, 2015, at 13:54, Colin Percival wrote:
> On 07/14/15 09:15, Mark Felder wrote:
> > On Tue, Jul 14, 2015, at 07:36, Sydney Meyer wrote:
> >> - Dropped/Stalled Connections with TCP Segmentation Offload and pf
> >> enabled.
> > 
> > TSO is a known issue. I've been turning it off for years to get FreeBSD
> > to play nice on Xen.
> 
> More precisely *pf* is a known issue.  It's inserting TCP checksums
> into TSO packets.  I reported this a long time ago and I don't know
> why pf still hasn't been fixed.
> 

I think Kristof may have solved this in HEAD with all of the care and
feeding he has been doing to pf, but I haven't verified.