Dns cache

[blueshark]

How to increase dns cache with last Merlin ?

 

[ColinTaylor]

Search the forums, this has been discussed before.

 

[john9527]

Note also that the latest dnsmasq (in the Merlin 386 alpha) limits your ability to greatly expand the cache size since it causes a performance hit.

 

[blueshark]

Note also that the latest dnsmasq (in the Merlin 386 alpha) limits your ability to greatly expand the cache size since it causes a performance hit.

Ok. Thank’s

 

[ColinTaylor]

https://www.snbforums.com/threads/cant-change-dnsmasq-cache-size.38014/#post-347201

 

[thelonelycoder]

Note also that the latest dnsmasq (in the Merlin 386 alpha) limits your ability to greatly expand the cache size since it causes a performance hit.

Do you happen to know that limit of the cache size?

 

[john9527]

Do you happen to know that limit of the cache size?

Actually, it turns out he made another change.....now issue a warning instead of enforcing a limit. Warning is set for cache > 10000

my_syslog(LOG_WARNING, _("cache size greater than 10000 may cause performance issues, and is unlikely to be useful."));

 

[thelonelycoder]

Actually, it turns out he made another change.....now issue a warning instead of enforcing a limit. Warning is set for cache > 10000

my_syslog(LOG_WARNING, _("cache size greater than 10000 may cause performance issues, and is unlikely to be useful."));

Thanks a bunch, will use that in AB as well.

 

[ColinTaylor]

Default cache size is 1500 ?

In this firmware, yes. That's up from dnsmasq's default value of 150.

 

[RMerlin]

Nobody so far ever showed me a cache usage of 100%. Every DNS record has an associated TTL (Time To Live) value, meaning that they expire within a few hours at most, so nobody with an home network as ever managed to fill up the 1500 entries cache. And as pointed out, larger caches will negatively impact performance rather than help.

 

[blueshark]

In this firmware, yes. That's up from dnsmasq's default value of 150.

I saw in dnsmasq.conf 1500

 

[ColinTaylor]

I saw in dnsmasq.conf 1500

Is that meant to be a question? We've just told you it's 1500.

 

[thelonelycoder]

How to increase dns cache with last Merlin ?

If you use AB-Solution, there are experimental settings es in the sub menu sm. When enabled you have the option to set the Dnsmasq cache-size between 500 and 10000.