robdns

Nice, except recvmmsg() is broken. http://man7.org/linux/man-pages/man2/recvmmsg.2.html The timeout argument does not work as intended. The timeout is checked only after the receipt of each datagram, so that if up to vlen-1 datagrams are received before the timeout expires, but then no further datagrams are received, the call will block forever. Which makes it useless for any application that wants to service data in a short time frame. The only way around it is to use a "self clocking" method. If you want to receive packets at least every 10ms, set a 10ms timeout... and then be sure to send yourself a packet every 10ms. I've done similar tests with UDP applications. It's possible to get 500K pps on a multi-core system with a test application that isn't too complex, or uses too many tricks. The problem is that the sy

Few nitpicks found while skimming through the source. fd = socket(AF_INET6, SOCK_DGRAM, 0); if (fd <= 0) { This should be fd == -1. fd == 0 is valid. https://github.com/robertdavidgraham/robdns/blob/master/src/... https://github.com/robertdavidgraham/robdns/blob/master/src/... check errors from sendto() & recvfrom(). you don't want to loop infinitely when fd is hosed. https://github.com/robertdavidgraham/robdns/blob/master/src/... Check return value of your mallocs. https://github.com/robertdavidgraham/robdns/blob/master/src/... Check return value of fd.