On 2018-11-16, Kapetanakis Giannis <[email protected]> wrote: > Hi, > > after upgrading one of my bind (cache resolver) machines to 6.4 (release) I'm > getting these errors quite often: > > Nov 16 15:55:14 server named[30616]: client: warning: client @0x6591da02440 > xxx.xxx.xxx.xxx#39702 (a1928.d.akamai.net): error sending response: would > block > > https://kb.isc.org/docs/aa-00717 > it's either EWOULDBLOCK or EAGAIN errors. > > I've tried playing with -U and -n settings. > Setting -n 1 (one cpu/core) solves the problem > > Ideally I would set it to -n 8 -U 8 > > any ideas?
Maybe try raising sysctl net.inet.udp.sendspace?
