better performance with 32 bit ! why?

iharrathi.ext at iharrathi.ext at
Wed Jun 29 12:31:32 UTC 2011

The 64 bit server(server1) is faster than the 32 bit server (server2).

>Test1: OS 64 bit, bind 64 bit ==> 50000 qps server1
>Test2: OS 32 bit, bind 32 bit ==> 70000 qps server2
>Test3: OS 64 bit, bind 32 bit ==> 50000 qps server1


Message: 5
Date: Wed, 29 Jun 2011 13:39:43 +0200
From: Matus UHLAR - fantomas <uhlar at>
Subject: Re: bind-users Digest, Vol 902, Issue 1
To: bind-users at
Message-ID: <20110629113943.GB3652 at>
Content-Type: text/plain; charset=us-ascii; format=flowed

On 29.06.11 11:04, iharrathi.ext at wrote:
>@ Andreas i made the test and i have the same performance as OS 64 bind 64.

>NB: when i reach the maximum throughput i still have enough free RAM, 
> free CPU, free NIC capacity.  So the limit is in Bind.  What to do to 
> reach more capacity?

Get faster CPU. Or get a L3 switch and more machines behind it.

>Test1: OS 64 bit, bind 64 bit ==> 50000 qps
>Test2: OS 32 bit, bind 32 bit ==> 70000 qps
>Test3: OS 64 bit, bind 32 bit ==> 50000 qps

Did you try this on the same maching, or are you still using 32-bit OS 
on machine with faster CPU and 64-bit OS on slower CPU-machine?

Matus UHLAR - fantomas, uhlar at ;
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