Hello, we are running a BIND 9.6.1-P1 on a SPARC T2000 / Solaris 10 for a recursive DNS server. I set up a simple MRTG monitoring tool which basically runs "dig ." and parses the output to find out a response time. The typical response time is 1ms. Workload on the server sometimes gradually increases, but the DNS servers response time is not increasing proportionally. When the number of requests hits about 5500/sec the DNS response time abruptly goes down to 400-500ms. The load average and processor utilization do increase proportionally to the number of requests. The problem starts when the load average gets to about 10 and named binary consumes about 55% of CPU time. There are no network or protocol errors (except insignificant number of udpInErrors), no heavy disk I/O. Just curious if anybody else observed a similar behavior. Any ideas are greatly appreciated. -- Rob
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