performance issues with 4096 subnets

[Glenn Satchell]

That is a well-known "feature" of the older releases. I seem to remember
reading about improved allocation methods and speedier startup, but can't
find anything in the RELNOTES file to indicate when this might have
happenned.

I think an upgrade to dhcp-4.1.1 would be definitely recommended and
worthwhile in your case. 3.0.5 was released in 2006, but the code base for
3.0 releases goes back about 10 years or so.

regards,
-glenn
--
Glenn Satchell       mailto:glenn.satchell at uniq.com.au  |  The squeaky
Uniq Advances Pty Ltd           http://www.uniq.com.au  |  wheel is the one
PO Box 70 Paddington NSW Australia 2021                 |  that makes the
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On Fri, August 10, 2012 10:48 am, Campbell.ColinD at police.qld.gov.au wrote:
> Hi,
>
> First post and there's an error :-(
>
> (b) should have read 10.128.0.0/9.
>
> Colin
> --
> Colin Campbell>
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> 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
>>
>>
>>
>