I used tcpdump to look at the network traffic, looking at both
interfaces of the LVS by running two tcdump processes.
The httpd real server introduces 200 millisecond delays between packets
when sending.
When I reconfigure the network so that I can connect directly without
LVS to the real server, there are no such delays in the traffic.
I (believe to) see the ACK packages from the http client in both cases,
they do not seem to get lost.
Who/what introduces the delay into this tcp socket, should it not be
turned off (via TCP_NODELAY)?
How can I look at the properties of he tcp sockets involved in the
connection?
Any help welcome, I need to get this fixed over the weekend!
On 26.11.11 15:46, Alois Treindl wrote:
I am setting up a new LVS NAT load balancer, running on Redhat
Enterprise Linux 6.
I have been runnign LVS NAT on RHEL for many years, our current load
balancer is on RHEL3, which isno longer supported by Redhat.
I have a very strnge problem: performance of http through the LVS is
extremely slow at something like 10 kbyte/sec, ridiculous.
I have made two approaches for the setup, but arrive at the same problem.
kernel: 2.6.32-131.17.1.el6.x86_64
ipvsadm-1.25-9.el6.x86_64 from Centos 6 (becaus my subscription for
RHEL6 does not include the load balancing)
Approach a)
I used my own old scripts based on ldirectord, ipvsadm and iptables
to configure and administer my setup as I did on my old LVS.
It worked, but as I said, extremely slow. 10 kByte/second !!!!
For the moment, I only set up http
Approach b)
I installed piranha-gui (piranha-0.8.5-7.el6.x86_64, also from centos6)
and configured the NAT lvs with it.
The simple setup looks like this:
TCP (my virtual ip):http wlc persistent 60
-> w2:http Masq 1000 0 0
-> w3:http Masq 1000 0 0
-> w4:http Masq 1000 0 0
Routing in the NAT LVS is:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.53.104.0 0.0.0.0 255.255.255.128 U 0 0 0 eth1
10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 192.53.104.62 0.0.0.0 UG 0 0 0 eth1
routing in a real server is:
Destination Gateway Genmask Flags Metric Ref Use Iface
10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 em1
0.0.0.0 10.1.1.254 0.0.0.0 UG 0 0 0 em1
currently empty iptables:
iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ip6tables dito
Is something broken in RHEL6 regarding LVS NAT use?
Or am I doing something stupid without noticing?
I need to get this thing running over the weekend, but am running
against a wall!
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