hi , I noticed that at peak hours, BIND response time is relatively high for some servers.non-cached query takes over 700msI set some kernel parameters to tune the network and sockets for redhat 6 and set some global options to tune the BIND by modifying the cache settings, but neither I get the cache I set the limit to filed up, nor I get better performance. some settings are as below, kernel sysctl:============net.ipv4.ip_local_port_range = 1024 65535 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_tw_reuse = 1 net.core.rmem_max = 33554432 net.core.wmem_max = 33554432net.ipv4.tcp_max_syn_backlog = 16384 net.ipv4.tcp_max_orphans = 400000net.core.somaxconn = 4096net.ipv4.tcp_rmem = 4096 87380 33554432 net.ipv4.tcp_wmem = 4096 65536 33554432
bind named.conf global options:========================= cleaning-interval 1440; max-cache-ttl 2419200; max-ncache-ttl 86400; max-cache-size 5120m; server specs:===========memory is 8GB memory usage is not exceeding 20% or 1.7GB while the cache is limited to 5GB as shown in the settings above, i wouldn't be more happier if i could have seen memory utilization spikes to the sky. could you please suggest !!! thanks
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