Hello! Since upgrading pdns-recursor instances in a mail cluster environment from 3.1 to 3.3, we noticed that the positive and negative cache sizes seem to grow much larger, and don't seem to follow the same pattern they used to, which seemed to look more like what one might expect with average encountered TTLs. Since the upgrade, I have never seen the cache shrink, only grow.
I posted these graphs earlier, showing the situation about two weeks after the upgrade: http://0x.ca/sim/tmp/nsc08-pdns_recursor-upgrade.html It started hitting swap at our original max-cache-entries setting (9M), so we've restarted it with 6M, and it's just about to reach that now: [sroot@nsc08:/root]# rec_control get-all | awk '{printf "%10u %s\n",$2,$1}' 30227604 all-outqueries 0 dlg-only-drops 1961 dont-outqueries 678286 outgoing-timeouts 40871 tcp-outqueries 185278 throttled-out 185278 throttled-outqueries 43632 unreachables 531886 answers-slow 10631721 answers0-1 1526028 answers1-10 10980909 answers10-100 4789382 answers100-1000 0 case-mismatches 247107 chain-resends 0 client-parse-errors 0 edns-ping-matches 0 edns-ping-mismatches 0 ipv6-outqueries 28218834 no-packet-error 30268556 noedns-outqueries 186307287 noerror-answers 0 noping-outqueries 25088 nsset-invalidations 30361670 nxdomain-answers 0 over-capacity-drops 0 qa-latency 217550214 questions 0 resource-limits 590 server-parse-errors 881109 servfail-answers 0 spoof-prevents 0 tcp-client-overflow 8985 tcp-questions 0 unauthorized-tcp 0 unauthorized-udp 878 unexpected-packets 5994112 cache-entries 9688816 cache-hits 18771115 cache-misses 3 concurrent-queries 600006 negcache-entries 7076 nsspeeds-entries 500032 packetcache-entries 189090331 packetcache-hits 28450967 packetcache-misses 3683842 sys-msec 0 tcp-clients 143 throttle-entries 603558 uptime 11785408 user-msec What were throttled outqueries seem to have been replaced with outqueries. This probably resulted in the latency changes. I suspect the packet cache is probably causing the lower main cache hit rate. Simon- _______________________________________________ Pdns-users mailing list [email protected] http://mailman.powerdns.com/mailman/listinfo/pdns-users
