too many open file descriptors messages since bind 9.4.2-P1 (port dns94)

Kris Kennaway kris at
Tue Jul 15 21:28:21 UTC 2008

JINMEI Tatuya / 神明達哉 wrote:
> At Tue, 15 Jul 2008 23:09:30 +0200,
> Kris Kennaway <kris at> wrote:
>>> If that's regularly happening, I'm afraid recent P1 versions don't
>>> handle that well, and recommend you try 9.4.3b2 ore 9.5.1b1.
>> Or increase the number of file descriptors as a workaround, per my email :)
> Does FreeBSD allow an application to increase FD_SETSIZE (at its
> compilation time)?  I thought FD_SETSIZE defaults to 1024.  Any
> 9.x.y-P1 versions can only open FD_SETSIZE sockets, regardless of the
> # FDs limit.
> Besides, I guess that the P1 versions severely suffer from heavy
> overhead of select(2) when it regularly opens more than 1000 sockets.
> Even if 'too many open file' messages are gone, many users won't
> accept the increased load due to the overhead.  Beta versions use
> kqueue, eliminating the fundamental overhead as well as the (too low)
> limitation of # of descriptors.

Ah yes, I hadnt thought about select limitations.


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