bind-9.3.1 stops answering queries for nearly a minute/hour

[Mark Andrews]

> NB . = 0-10ms, : = 10-100ms, * = 101-800ms, T = > 800ms
> 
> 60 mins: 24 * >800ms + 9 * 100-800ms = > 19.2secs
> 12:34: ............................................................    2/  5
> 12:35: ....:............................................**TTT*TTTTT   27/589
> 12:36: TTTTTTTTTT**TT**TTTT**......................................   79/807
> 12:37: ............................................................    2/  5
> 12:38: ..............................................*.......:.....   14/678
> 
> 5 mins:  0 * > 800ms + 6 * < 26ms = < 156ms
> 15:12: ............................................................    2/ 10
> 15:13: ...........::::::......................................:....    4/ 26
> 15:14: ............................................................    2/  6
> 15:15: ............................................................    2/  5
> 15:16: ............................................................    2/  6
> 15:17: ............................................................    2/  6
> 15:18: .................::::.::....................................    6/ 78
> 15:19: ....................T...........:...........................    3/ 56
> 
> so while the 5 minute cleaning cycle runs 12 times as often, the total
> query delay during each cycle can be about 1% of that during each 60 min
> cleaning cycle. NB it's probably true to say there is more variation
> in total query delay for the 5min cleaning cycle, and sometimes it would
> approach a second.
> 
> Danny

	Less pages swapped out would be my guess for the difference.

	BIND 9.4.0 has some changes that are designed to help address
	the issue.
 
	Mark
--
Mark Andrews, ISC
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PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org