bind-users Digest, Vol 979, Issue 3

TMK engtmk at gmail.com
Thu Sep 22 22:50:32 UTC 2011


> On 9/21/2011 5:00 PM, TMK wrote:
>> I have couple of questions.
>>
>> bind cache memory limit is 4GB. can I increase it. or this is hard-coded limit.
>>
>> i'm running the x64 bit version.
> You can _try_ to raise that limit above 4Gb (see the various
> configuration elements under "Operating System Resource Limits" in the
> ARM), but your OS may still limit you. You'd need to look at your OS
> documentation to see how to raise "soft" and/or "hard" limits.


if i try to set the max-cache size to more that 4GB it says very large number.

and the default if left un-set it should be unlimited as per ARM.

>> also to increase the cache hit ratio I have created script to query my
>> dns for the top 1 million sites. would this give any performance
>> advantages or is it useless.
>>
> Since a large percentage of those top sites use DNS-based load-balancing
> with small TTLs on their records, it's pretty useless.
>
> Of course, you can measure your cache hit ratio to see if it's really
> helping you or not. Real data always beats pure speculation.
>
>
>                                                                     - Kevin

to use more memory I have created two instances of the bind. one is
listening on the machine IP addr. and the other on the loop-back
address (127.0.0.1).

i have set the first instance (which is accepting the client
connection) to forward only and the forwarders is the 127.0.0.1.

would this give me better cache hit ratio.



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