Re: djbdns: Current recommended patches?

On Mon, May 18, 2009 at 07:34:07PM +0100, Andrew Richards wrote:

>  - (www.your.org/dnscache/) Merge identical outgoing requests:
>    anti-cache-poisoning measure. As Jeff King the author notes
>    GMANE/14017, this includes a linear search of outstanding requests,
>    which is inefficient; there's also an issue with lame delegations
>    (GMANE/13862) which makes me wonder if this is still a
>    work-in-progress (GMANE/13925)...?

It is still a work in progress. But you are actually confusing two
versions of the patch in your paragraph.

The patch at your.org has issues with lame delegations; I posted some
followups under this thread that improve the situation:

  http://article.gmane.org/gmane.network.djbdns/13862

However there are some fundamental flaws with that approach, as
discussed in the thread.

I posted a new from-scratch patch here:

  http://article.gmane.org/gmane.network.djbdns/13965

which is the one that has poor performance. The problem spots are
obvious (linear searches for each query lookup), but I haven't had time
to measure or fix it yet.

-Peff