BIND 9.7.3-P3-RedHat-9.7.3-8.P3.el6_2.3 Very High CPU Utilization

[Shon Stephens]

Dear All,
     I am running the version of BIND provided by RPM packages with RHEL 6.2. This is a new server build replacing a previous server. That host was running an earlier version of BIND and and earlier version of RHEL. The config files have remained relatively the same, but the CPU utilization of the newer version is magnitudes of order higher.

PID         USER      PR  NI  VIRT   RES   SHR  S  %CPU %MEM    TIME+         COMMAND
30462    named  20   0    282m  80m 2588 S  43.5     2.1             378:33.05   named

I've seen other posts about missing "managed-keys" directive and attempted to add that to my config as a solution. This does not seem to help. Here is my named.conf (sanitized). I've made sure that recursion is limited to our ACL and there doesn't seem to be any difference from previous periods in the number of queries being answered by the server. Any help is much appreciated.

Yours,
Shon


~]# rndc status
version: 9.7.3-P3-RedHat-9.7.3-8.P3.el6_2.3
CPUs found: 2
worker threads: 2
number of zones: 84
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is ON
recursive clients: 6/0/1000
tcp clients: 0/100
server is up and running

// named.conf - BIND name server configuration file
include "/etc/rndc.key";
controls {
        inet 127.0.0.1 port 953
        allow { 127.0.0.1; };
};
// Blackhole requests from these networks
acl "bogusnets" {
        0.0.0.0/8;
        1.0.0.0/8;
        2.0.0.0/8;
        192.0.2.0/24;
        224.0.0.0/3;
};
// Trusted networks
acl "trusted" {
  some_trusted_networks;
};
// Trusted name servers
acl "nameservers" {
        some_ips_of_nameservers;
};
// Global config options
options {
        directory "/var/named";
        dump-file "data/cache_dump.db";
        statistics-file "data/named_stats.txt";
                managed-keys-directory "/var/named/dynamic";
        blackhole { "bogusnets"; };
                allow-query { any; };
        allow-query-cache { "trusted"; };
                allow-recursion { "trusted"; };
        allow-transfer { "nameservers"; };
        transfer-source 192.168.101.101;
        also-notify { "nameservers"; };
        allow-notify { "nameservers" };
        notify explicit;
                dnssec-enable no;
                dnssec-validation no;
                listen-on-v6 { none; };
};
server 192.168.101.101 {
                edns no;
};
logging {
        channel "misc" {
                file    "logs/named.log" versions 4 size 2m;
                print-category  yes;
                print-severity  yes;
                print-time      yes;
        };
        channel "xfers" {
                file    "logs/named.xfers" versions 4 size 1m;
                print-severity  yes;
                print-time      yes;
        };
        channel "debug" {
                file    "logs/named.debug" versions 1 size 2m;
                print-category  yes;
                print-severity  yes;
                print-time      yes;
        };
        channel "ops" {
                file    "logs/named.ops" versions 3 size 2m;
                print-category  yes;
                print-severity  yes;
                print-time      yes;
        };
        channel "sys" {
                syslog  daemon;
                print-category  yes;
        };
        category "xfer-in"      { "xfers"; };
        category "xfer-out"     { "xfers"; };
        category "notify"       { "xfers"; };
        category "database"     { "debug"; };
        category "config"       { "debug"; };
        category "queries"      { "ops"; };
        category "client"       { "ops"; };
        category "resolver"     { "ops"; };
        category "security"     { "sys"; "misc"; };
        category "default"      { "misc"; };
};
// Default zones
zone "." {
        type hint;
        file "zones/root/db.root";
};
zone "localhost" {
        type master;
        file "zones/local/db.local";
};
zone "127.in-addr.arpa" {
        type master;
        file "zones/local/db.127";
};
zone "0.in-addr.arpa" {
        type master;
        file "zones/local/db.0";
};
zone "255.in-addr.arpa" {
        type master;
        file "zones/local/db.255";
};
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/bind-users/attachments/20120710/a6210374/attachment.html>