Re: Stale entries in dnscache's cache structure

On Wed, Mar 10, 2010 at 1:39 PM, Laurent Bercot <[email protected]> wrote:
>  Let's be a bit technical for a change, shall we?

:)

>  I studied dnscache's cache structure, and am appalled by its simplicity.
> It's just beautiful that such a simple structure can be used; no wonder
> dnscache is fast.

Agreed.

>  What do you think ? Should I go for the theoretically better solution,
> or does usage show that this flaw in dnscache is never a problem in
> practice and simplicity wins ?

I think it would be interesting to see comparisons on how dnscache
behaves under different cache implementation strategies (e.g.,
memcached's probably has very similar requirements, since it's a fixed
memory key/value store with expiration times).  The existing approach
is certainly remarkably simple and demands very little CPU work for
reads and writes while also keeping memory overhead to a minimum.

If you do any experiments, be sure to keep up informed. :)