[Dnsmasq-discuss] dnsmasq caching stats meaning

Simon Kelley simon at thekelleys.org.uk
Wed Jun 26 20:56:17 BST 2013


On 26/06/13 15:59, Olivier Mauras wrote:
> On 2013-06-26 16:33, Simon Kelley wrote:
>
>> On 26/06/13 15:21, Olivier Mauras wrote:
>>> Hello, I plan to deploy dnsmasq on a medium sized network as primary
>>> caching DNS for both workstations and servers - 1500 workstations /
>>> 600 servers. I'm currently testing it on a test subnet with around 50
>>> workstations and have been wondering about the cache stats.
>>> dnsmasq[27357]: time 1372247969 dnsmasq[27357]: cache size 2000,
>>> 0/65220 cache insertions re-used unexpired cache entries.
>>> dnsmasq[27357]: queries forwarded 22019, queries answered locally
>>> 11238 dnsmasq[27357]: server xx.xx.xx.164#53: queries sent 5812,
>>> retried or failed 0 dnsmasq[27357]: server xx.xx.xx.165#53: queries
>>> sent 5812, retried or failed 0 dnsmasq[27357]: server
>>> xx.xx.xx.114#53: queries sent 16201, retried or failed 30
>>> dnsmasq[27357]: server xx.xx.xx.115#53: queries sent 925, retried or
>>> failed 10 What exactly means "0/65220 cache insertions re-used
>>> unexpired cache entries"??
>> It means dnsmasq handled 65520 names lookups that needed to be sent to
>> upstream severes that nothing was thrown out of the cache before
>> reaching the end of its time-to-live, to make room for a newer name. For
>> the first number, smaller is better.
>>
>> Simon.
>>
>>
>>
>>
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>
>
> Thanks for the clarification Simon, i was wondering if the cache was
> correctly used :)

> If i understand you correctly it means that when the cache is filled,
> newer queries won't be cached as long as a cached one has not expired,
> right ?

No. new queries are always cached. If the cache is full with entries 
which haven't reached the end of their time-to-live, then the entry 
which hasn't been looked up for the longest time is evicted.
>
> Any drawback to max cache-size value to 10000 ?

Only memory use.

Simon.

>
>
> -O.
>
>
>
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