I'm using bind-dlz(bind version 9.10) with mysql to store zone data.
According to the dlz official documents I use the compile arguments "
-enable-threads=no".
Now I use dnstop and netstat to monitor the performance,and find there is a
perfomance bottleneck of bind-dlz.
Once the QPS increses to 500-600,the response time of each dns query will be
very large , up to 600msec-1000msec.And the Recv-Q of udp socket where reach
124928.(the default /proc/sys/net/core/rmem_default value)
# dnstop eth1 -R -Q
Queries: 519 new, 9326898
Replies: 508 new, 6612496 total
# watch -n 1 netstat -lnp
Proto Recv-Q Send-Q Local Address Foreign Address
State PID/Program name
udp 124813 0 121.199.47.200:53 0.0.0.0:*
31867/named
I think 500-600 QPS is too low,is it the normal performance of bind-dlz?How to
optimize it?_______________________________________________
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