Re: dnscache performance still applicable today?

jDon't forget that on multiple cpu systems that the network and os can
run on a different cpu so DJB (like all other single thread software)
does still benefit from SMP


On 5/24/09, Rihad <[email protected]> wrote:
> Paul Jarc wrote:
>> Rihad <[email protected]> wrote:
>>> Let's please not forget where it all started:
>>> 2009-05-24 18:42:48.254665500 stats 2098047 158736598 190 0
>>> that 190 "queries that dnscache has received via UDP but not yet
>>> responded to or dropped".
>>
>> Some queries, for various reasons, will never be answered.  Typically
>> this is due to a mistake in the authoritative server's configuration
>> or records, so there's nothing that can be done about it at the
>> resolver end.  But dnscache won't give up on those queries until it
>> fills up its table of 200 in-progress queries, at which point it
>> throws away the oldest query to make room for the next new one.
>> That's the only way that the old unanswerable queries will go away, so
>> once you've accumulated 200 of them, you'll always be close to that.
>>
> Aha. Thanks for the lower level explanation. Now I see what it means.
>