Hi,
We have several recursive cache bind servers and experiencing weird things
when named is compiled with-threads:
In 4 steps:
1) everything goes ok
2) for ~1h named began to answer slower (0,5ms to >100ms) and with symptoms:
- load increase on the server (from 0,3 to >4)
- number of recursive queries increase (+500%)
- number of recursive slot increase (from 200 to 600)
- cache hit decrease (from 9X% to
- number of cache entries drops from 2M to 0
3) named answer no query
- no recursive queries
- 0 entry in cache
- rndc stats/status works
4) We flush the named cache (rndc flush) and everything goes ok
We do a "rndc stats" every minute to get some stats.
Hardware:
- intel or amd with a total of 4 or 8 cores
- solaris 10
- bind 9.6.2 with threads (gcc) or bind 9.5.1-P3 with threads (SUNWspro)
any clue ?
some numbers from named.stats :
++ Name Server Statistics ++
437118882 IPv4 requests received
++ Zone Maintenance Statistics ++
++ Resolver Statistics ++
120096973 IPv4 queries sent
29784114 queries with RTT < 10ms
49289542 queries with RTT 10-100ms
33448291 queries with RTT 100-500ms
277957 queries with RTT 500-800ms
105059 queries with RTT 800-1600ms
31079 queries with RTT > 1600ms
[View: _bind]
++ Socket I/O Statistics ++
120075062 UDP/IPv4 sockets opened
35059 TCP/IPv4 sockets opened
120074870 UDP/IPv4 sockets closed
42651 TCP/IPv4 sockets closed
13116 UDP/IPv4 socket bind failures
5513 TCP/IPv4 socket connect failures
120061921 UDP/IPv4 connections established
6901 TCP/IPv4 connections established
7599 TCP/IPv4 connections accepted
276089 UDP/IPv4 recv errors
315 TCP/IPv4 recv errors
++ Cache DB RRsets ++
[View: mire]
[View: abonnes]
885677 A
751488 NS
171869 CNAME
144655 PTR
312051 MX
41667 RRSIG
38816 NSEC
130572 NXDOMAIN
--
Fabien
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