performance issues with 4096 subnets

Campbell.ColinD at police.qld.gov.au Campbell.ColinD at police.qld.gov.au
Fri Aug 10 00:48:54 UTC 2012


Hi,

First post and there's an error :-(

(b) should have read 10.128.0.0/9.

Colin
--
Colin Campbell
Security Specialist
Public Safety Network Management Centre
p: (07) 3008 4851
f: (07) 3008 4799
e: campbell.colind at police.qld.gov.au


> -----Original Message-----
> From:
dhcp-users-bounces+campbell.colind=police.qld.gov.au at lists.isc.org
>
[mailto:dhcp-users-bounces+campbell.colind=police.qld.gov.au at lists.isc.o
rg]
> On Behalf Of Campbell.ColinD(CC)
> Sent: Friday, 10 August 2012 10:46 AM
> To: dhcp-users at lists.isc.org
> Subject: performance issues with 4096 subnets
> 
> Hi,
> 
> I'm seeking some guidance. I'm running RHEL5 with dhcpd-3.0.5
(probably
> a bad start :-).
> 
> We have a requirement to subdivide:
> 
> a) 10.0.0.0/9 into 32k subnets, each a /24 with 4 pools in each subnet
> b) 10.128.0.0 into 4k subnets, each a /21 with 1 pool in each subnet
> 
> So far we've only attempted (b). The results are less than impressive.
> 
> 1. A "configtest" takes approximately 90 minutes.
> 2. The daemon takes approximately 90 minutes to start.
> 
> All the time seems to be taken allocating memory for all the
addresses.
> The process grows to about 2.5GBytes.
> 
> Will moving to RHEL6 with dhcpd-4.1.1 fix this slow start problem?
> 
> The server has dual hex-core CPUs and 40GB RAM.
> 
> Colin
> --
> Colin Campbell
> Security Specialist
> Public Safety Network Management Centre
> p: (07) 3008 4851
> f: (07) 3008 4799
> e: campbell.colind at police.qld.gov.au
> 
> 
> 
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