[Bug 154428] [xen] xn0 network interface and PF - Massive performance drop

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=154428

--- Comment #13 from Bryan Drewery <bdrewery at FreeBSD.org> ---
(In reply to Bryan Drewery from comment #11)
> I just hit this on 10.1-GENERIC on EC2. Empty pf.conf with pf enabled =
> horrible performance. Disabling pf or TSO with pf fixes it.

My exact issue with with ifconfig having TSO4 on the interfaces. Just changing
the sysctl to 0 fixes the issue. Setting to 1 brings back the extreme packet
loss/latency issues.

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