resolving from loopback is much smooth?

[Eric Yiu]

Hi Graham,

Thx for your great tip, it seems it fix my problem.

Eric

On Tue, Jun 7, 2016 at 5:45 PM, Graham Clinch <g.clinch at lancaster.ac.uk>
wrote:

> Hi Eric,
>
> > I run bind dns server 9.9 now with around 3000query/s.  I recently
> > upgrade our server to Fujitsu M10-1 Solaris 10 with bind9.10.
> > I feel that the server serving bind is not as fast as old one in intel
> > solaris which was more than 8 years ago.  I tried a few test
> > and found that dig @localhost is much more smooth thatn dig @IP the zone
> > at the machine.
>
> Which specific version of 9.10 are you running?  There is a reported
> issue with prefetch in versions before 9.10.4 (and prefetch is enabled
> by default in 9.10):
>
>
> https://kb.isc.org/article/AA-01315/0/prefetch-performance-in-BIND-9.10.html
>
> We saw similar problems that only affected the service IPs (when they
> were running 9.10.3) and on reviewing netstat saw large receive queues
> on the affected listeners.
>
> Disabling prefetch as discussed in the document helped us.
>
> (we've since moved to 9.10.4 but haven't yet re-enabled prefetch).
>
> Graham
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