clients-per-query

Mark Andrews Mark_Andrews at isc.org
Fri Nov 9 20:31:00 UTC 2007


> I've read what's in the ARM about clients-per-query, and think I  
> understand.
> My daily LogWatch digests are showing me the following.
> 
>     clients-per-query decreased to 10: 2 Time(s)
>     clients-per-query decreased to 11: 2 Time(s)
>     clients-per-query decreased to 12: 2 Time(s)
>     clients-per-query decreased to 13: 2 Time(s)
>     clients-per-query decreased to 14: 2 Time(s)
>     clients-per-query increased to 11: 2 Time(s)
> 
> I'm interpreting this as indicating some fluctuations about a "DC level"
> of about 12.  I wonder whether quite such dynamic tuning is useful and
> whether some more damping or hysteresis in the feedback loop would be
> harmful.

	There is hysteresis in the loop.   There's also a 20 minute
	timer between reductions which means something is being
	logged twice.  You can also set this in named.conf.
 
> /Niall
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org



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