On 19/11/2018 12:30, Stuart Henderson wrote: > On 2018-11-16, Kapetanakis Giannis <bil...@edu.physics.uoc.gr> 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? >
I've increased it to 41600 (same as recv), 131072, 1048576 without any change. Default is 9216 G
