On 01/06/2017 23:26, Mathew Ian Eis wrote: > … and for one last really crazy idea, you could try running a pair of > named instances on the machine and fronting them with nginx’s > supposedly scalable UDP load balancer. (As long as you don’t get a > performance hit, it also opens up other interesting possibilities > like being able to shift production load for maintenance on the named > backends).
It's relatively trivial to patch the BIND source to enable SO_REUSEPORT on the more recent Linux kernels that support it (3.8+, ISTR?) so that you can just start two BIND instances listening on the exact same ports and the kernel will do the load balancing for you. For a NUMA system, make sure each instance is locked to one die, but beware of NUMA bus transfers caused by incoming packet buffers being handled by a kernel task running on one die but then delivered to a BIND instance running on another. In the meantime we're also looking at SO_REUSEPORT even for single instance installations because it appears to offer an advantage over letting multiple threads all fight over one shared file descriptor. Ray _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
