Re: [lvs-users] Does LVS Choke a Little Bit Under High Load?

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] Does LVS Choke a Little Bit Under High Load?
From: Patrick Schaaf <netdev@xxxxxx>
Date: Fri, 25 Mar 2011 08:55:19 +0100
On Thu, 2011-03-24 at 14:23 -0700, Robinson, Eric wrote:
> I've been a little afraid of running any commands
> on the load balancer to count the number of connections during high
> production load.

You can get a good + fast total connection count from /proc/slabinfo:

egrep '^(nf_conntrack_|ip_vs_conn)' /proc/slabinfo 

Look at column 2, the first column with numbers.

Compare the numbers to
cat /proc/sys/net/nf_conntrack_max 
cat /sys/module/ip_vs/parameters/conn_tab_bits 

The conntrack_max is a HARD limit of the number of conntracks the system
can have.

2^conn_tab_bits for IPVS is the size of the ipvs tracking table - I'm
not sure whether that is a hard limit, or just a hash bucket sizing
which permits chaining.

best regards

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