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Extremely slow directory on Centos

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: Extremely slow directory on Centos
From: Somsak Sriprayoonsakul <somsaks@xxxxxxxxx>
Date: Tue, 31 Jan 2006 17:42:38 +0700
Hello,
I want to setup a web cluster on Centos 4.2 (RHEL4u2). Somehow benchmark result show that using LVS is extremely slow compared to single machine web server. It can perform only about 100-200 connection/s, while single machine can perform up to 2000/s. The experiment was done using the same machine as single web server and real server of LVS pool. My setup details are below

Hardware Setup
===========
3 nodes web cluster + 1 LVS director
All are using the same Hardware (ACER with P4 3.0GHz + HyperThreading , 1GB memory and on board gigabit ethernet (tg3 module)). Network: 3com 8 ports gigabit switches ( can't remember the model, sorry). The switch should work fine since it has been used in a working compute cluster until yesterday.

Software Setup
==========
Distros: Centos 4.2 (RHEL 4u2), ipvsadm 1.2.1. kernel version 2.6.9-22.0.2.ELsmp
Benchmark tools: WebStone 2.5 using 50 clients on 15 machines.
Networking: All machine has only single ethernet card. All configured with real IP.
LVS: Direct Routing + WLC (I've tried RR but the result is about the same)
Director setup : using iproute2 "ip addr add xx" command
Real server setup: using iproute2 on local loop back "ip addr add xx/32 dev lo scope host". + arp_announce = 2 & arp_ignore = 3, ip_conntrack_max = 262144
Web server: Apache httpd

Am I doing anything wrong? This is the second time that I tried LVS, the first time was many years ago when kernel 2.4 is just came out.

Regards,

-----------------------------------------------------------------------------------
Somsak Sriprayoonsakul

Scalable Computing Lab
High Performance Computing and Networking Center
Kasetsart University
ssy@xxxxxxxxxxxxxxxxxx
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