search for: mem_default

...e ensured all the disks are OK, the network card is OK (full duplex etc), switch is properly configured, retrans are around 4% (I am not sure if this above normal, read somewhere <5% is OK), ping latency is normal and tcpdump shows nothing unusual. The wsize/rsize is 8K and I have increased [rw]mem_default and [rw]mem_max in /proc/sys/net/core for tuning performance. I am sure the problem is being caused by rsync, since I tried it at different times of day and the problem is repeated. Also tried different bwlimits. Any...

...research and testing. 4) tinc.conf needs some settings for tuning SO_SNDBUF and SO_RCVBUF on the tunnel traffic sockets. I was getting tons of "Lost XXX packets from YYY" syslog messages initially before I worked around this by upping the default buffer sizes via /proc/sys/net/core/[rw]mem_default. This raises the default for all sockets opened on the host though, which is pretty heavy-handed. Adding this seems like a no-brainer to me. 5) Even with all of the above in place, I'm still getting some spam like this on the app servers: Lost 133 packets from lb Got late or replayed packet...