kern/154428: [xen] xn0 network interface and PF - Massive performance drop

[alex]

The following reply was made to PR kern/154428; it has been noted by GNATS.

From: alex <alex at ahhyes.net>
To: <bug-followup at FreeBSD.org>
Cc:  
Subject: Re: kern/154428: [xen] xn0 network interface and PF - Massive
 performance drop
Date: Sun, 13 Feb 2011 15:21:20 +1100

  Fixed by net.inet.tcp.tso: 1 -> 0
 
  but why?? found this by trial an error.  setting net.inet.tcp.tso to 0 
  with pf enabled gives good performance, if i set it to 1, speeds plumet 
  to below dialup!