--log-async[=<lines>]

Enable asynchronous logging and optionally set the limit on the number of lines which will be queued by dnsmasq when writing to the syslog is slow. Dnsmasq can log asynchronously: this allows it to continue functioning without being blocked by syslog, and allows syslog to use dnsmasq for DNS queries without risking deadlock. If the queue of log-lines becomes full, dnsmasq will log the overflow, and the number of messages lost. The default queue length is 5, a sane value would be 5-25, and a maximum limit of 100 is imposed.