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

JINMEI Tatuya / 神明達哉 Jinmei_Tatuya at
Tue Jul 15 22:39:10 UTC 2008

At Tue, 15 Jul 2008 15:12:31 -0700,
Bakul Shah <bakul at> wrote:

> > 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.
> Or more portably you can use poll(2).

I've not played with poll(2) in BIND9, but as far as I understand it,
it doesn't solve the fundamental overhead issue here.  For example,
the application should examine all possible descriptors even if only a
few of them are readable.

Anyway, since this is a FreeBSD specific list, I believe we can safely
assume the existence of kqueue, unless we are talking about a very old

JINMEI, Tatuya
Internet Systems Consortium, Inc.

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