Re: MERGEQUERIES consumes 100% CPU ?

On Sun, May 17, 2009 at 10:04:15AM +0200, Andreas Schulze wrote:

> this week I installed new DNS Software on ~50 servers.
> The software I use is exactly like https://andreasschulze.de/dns
> ( and https://andreasschulze.de/dns/djbdns/doit )

It looks like you are using the merge-query patch on top of the ipv6
patch (and then some other patches afterwards). Is that right?

> # strace -p 18637 2>&1 | tai64n | tai64nlocal > /tmp/dnscache.strace
> http://postmaster.datev.de/dnscache/dnscache.strace

This doesn't seem like the linear lookup problem that has been discussed
before; it looks like you are stuck in some kind of infinite loop
calling poll(). While I don't discount the possibility that it is
entirely the fault of the query-merging patch, I wonder if it is a bad
interaction with one of the other patches.

Is it possible for you to run a version of djbdns patched just with the
query-merging patch and see if you end up with the same issue?

-Peff