From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tom Lendacky <tahm@linux.vnet.ibm.com>
Subject: Re: Network performance with small packets - continued
Date: Wed, 9 Mar 2011 10:17:06 -0600
Message-ID: <201103091017.07095.tahm@linux.vnet.ibm.com>
References: <201103071631.41964.tahm@linux.vnet.ibm.com> <20110309071744.GA26270@redhat.com>
Mime-Version: 1.0
Content-Type: Text/Plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Cc: kvm@vger.kernel.org
To: "Michael S. Tsirkin" <mst@redhat.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from e5.ny.us.ibm.com ([32.97.182.145]:41103 "EHLO e5.ny.us.ibm.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1755167Ab1CIQRO (ORCPT <rfc822;kvm@vger.kernel.org>);
	Wed, 9 Mar 2011 11:17:14 -0500
Received: from d01dlp01.pok.ibm.com (d01dlp01.pok.ibm.com [9.56.224.56])
	by e5.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id p29FqL7F018128
	for <kvm@vger.kernel.org>; Wed, 9 Mar 2011 10:52:21 -0500
Received: from d01relay03.pok.ibm.com (d01relay03.pok.ibm.com [9.56.227.235])
	by d01dlp01.pok.ibm.com (Postfix) with ESMTP id 2F69F38C8038
	for <kvm@vger.kernel.org>; Wed,  9 Mar 2011 11:17:11 -0500 (EST)
Received: from d01av04.pok.ibm.com (d01av04.pok.ibm.com [9.56.224.64])
	by d01relay03.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p29GHD7k326372
	for <kvm@vger.kernel.org>; Wed, 9 Mar 2011 11:17:13 -0500
Received: from d01av04.pok.ibm.com (loopback [127.0.0.1])
	by d01av04.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p29GHCgc003206
	for <kvm@vger.kernel.org>; Wed, 9 Mar 2011 11:17:12 -0500
In-Reply-To: <20110309071744.GA26270@redhat.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On Wednesday, March 09, 2011 01:17:44 am Michael S. Tsirkin wrote:
> On Mon, Mar 07, 2011 at 04:31:41PM -0600, Tom Lendacky wrote:
> > I used the uperf tool to do this after verifying the results against
> > netperf. Uperf allows the specification of the number of connections as
> > a parameter in an XML file as opposed to launching, in this case, 100
> > separate instances of netperf.
> 
> Could you post the XML on the list please?

Environment variables are used to specify some of the values:
  uperf_instances=100
  uperf_dest=192.168.100.28
  uperf_duration=300
  uperf_tx_msgsize=256
  uperf_rx_msgsize=256

You can also change from threads to processes by specifying nprocs instead of 
nthreads in the group element.  I found this out later so all of my runs are 
using threads. Using processes will give you some improved peformance but I 
need to be consistent with my runs and stay with threads for now.

<?xml version="1.0"?>
<profile name="TCP_RR">
  <group nthreads="$uperf_instances">
        <transaction iterations="1">
            <flowop type="connect" options="remotehost=$uperf_dest 
protocol=tcp"/>
        </transaction>
        <transaction duration="$uperf_duration">
            <flowop type="write" options="size=$uperf_tx_msgsize"/>
            <flowop type="read"  options="size=$uperf_rx_msgsize"/>
        </transaction>
        <transaction iterations="1">
            <flowop type="disconnect" />
        </transaction>
  </group>
</profile>