Need to improve named performance

Jack Tavares j.tavares at
Tue Nov 13 18:33:41 UTC 2012

One issue that *may* be impacting you (and another reason to upgrade)
is the size of the receive buffer within named was bumped up in 9.5 or 9.6

Jack Tavares
From: at [ at] on behalf of Florian Weimer [fw at]
Sent: Sunday, November 11, 2012 13:46
To: Ed LaFrance
Cc: bind-users at
Subject: Re: Need to improve named performance

* Ed LaFrance:

> Running BIND 9.3.6-P1-RedHat-9.3.6-16.P1.el5 on a quadcore xeon server
> (3Ghz) with 2GB RAM. Named is being used only for rDNS queries against
> our address space.

You should really upgrade to the latest version on that branch (likely

> The bottom line is: I need to improve named performance. Tcpdump only
> shows about 20 requests per second on average, I would estimate. This
> should be handled easily, but instead it's gagging on it and the
> requests are stacking up.

Something is stalling the named process.  Try to run "strace -T -f -p
4509" (4509 is the PID for the named process) and see where named
spends its time.  The top output you quoted suggests that the process
is not spinning in user space.
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