From owner-freebsd-xen@FreeBSD.ORG  Sun Feb 13 04:31:02 2011
Return-Path: <owner-freebsd-xen@FreeBSD.ORG>
Delivered-To: freebsd-xen@freebsd.org
Received: from mx2.freebsd.org (mx2.freebsd.org [IPv6:2001:4f8:fff6::35])
	by hub.freebsd.org (Postfix) with ESMTP id D06331065674
	for <freebsd-xen@freebsd.org>; Sun, 13 Feb 2011 04:31:02 +0000 (UTC)
	(envelope-from cperciva@freebsd.org)
Received: from xps.daemonology.net (freefall.freebsd.org
	[IPv6:2001:4f8:fff6::28])
	by mx2.freebsd.org (Postfix) with SMTP id 96F8C152650
	for <freebsd-xen@freebsd.org>; Sun, 13 Feb 2011 04:31:01 +0000 (UTC)
Received: (qmail 86200 invoked from network); 13 Feb 2011 04:31:07 -0000
Received: from unknown (HELO xps.daemonology.net) (127.0.0.1)
	by localhost with SMTP; 13 Feb 2011 04:31:07 -0000
Message-ID: <4D575E8B.7080804@freebsd.org>
Date: Sat, 12 Feb 2011 20:31:07 -0800
From: Colin Percival <cperciva@freebsd.org>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US;
	rv:1.9.1.16) Gecko/20101220 Thunderbird/3.0.11
MIME-Version: 1.0
To: Alex <joovke@joovke.com>
References: <201102010540.p115eCXp089392@freefall.freebsd.org>
	<4D575B99.6070204@joovke.com>
In-Reply-To: <4D575B99.6070204@joovke.com>
X-Enigmail-Version: 1.0.1
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Cc: freebsd-xen@freebsd.org, bug-followup@FreeBSD.org
Subject: Re: kern/154428: xn0 network interface and PF - Massive performance
 drop
X-BeenThere: freebsd-xen@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussion of the freebsd port to xen - implementation and usage
	<freebsd-xen.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-xen>,
	<mailto:freebsd-xen-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-xen>
List-Post: <mailto:freebsd-xen@freebsd.org>
List-Help: <mailto:freebsd-xen-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-xen>,
	<mailto:freebsd-xen-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 13 Feb 2011 04:31:03 -0000

On 02/12/11 20:18, Alex wrote:
> 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!

There have been problems with Xen and TSO in the past relating to how much
data gets handed off to the hypervisor at once... why this would cause issues
only with PF, I have no idea, though.

-- 
Colin Percival
Security Officer, FreeBSD | freebsd.org | The power to serve
Founder / author, Tarsnap | tarsnap.com | Online backups for the truly paranoid