Networking Tests Basic..

http://forums.whirlpool.net.au/archive/116165

https://fasterdata.es.net/host-tuning/linux/expert/
https://github.com/esnet/iperf/issues/356
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Tuning_and_Optimizing_Red_Hat_Enterprise_Linux_for_Oracle_9i_and_10g_Databases/sect-Oracle_9i_and_10g_Tuning_Guide-Adjusting_Network_Settings-Changing_Network_Kernel_Settings.html
http://linuxgazette.net/135/pfeiffer.html
https://www.nas.nasa.gov/hecc/support/kb/optional-advanced-tuning-for-linux_138.html


TEST CMDS
#reciver
nc -v -l 2222 > /dev/null
iperf -s

#sender
dd if=/dev/zero bs=1024K count=819 | nc -v 119.9.22.14 2222


#########
#DEFAULTS on 80 MBit-
net.core.wmem_default = 212992 [0.212992 MByte]
net.core.wmem_max = 33554432  [33.554432 MByte]
net.ipv4.tcp_wmem = 4096    65536   33554432
net.ipv4.udp_wmem_min = 4096
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.eth0.stable_secret"
sysctl: reading key "net.ipv6.conf.eth1.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
vm.lowmem_reserve_ratio = 256   256 32  1

858783744 bytes (859 MB, 819 MiB) copied, 172.288 s, 5.0 MB/s

DEFAULT on 5GBit [2.5 OutBound]
net.core.optmem_max = 20480
net.core.rmem_default = 212992
net.core.rmem_max = 33554432
net.core.wmem_default = 212992
net.core.wmem_max = 33554432
net.ipv4.igmp_max_memberships = 20
net.ipv4.tcp_mem = 723129   964173  1446258
sysctl: reading key "net.ipv6.conf.all.stable_secret"
net.ipv4.tcp_rmem = 4096    87380   33554432
net.ipv4.tcp_wmem = 4096    65536   33554432
net.ipv4.udp_mem = 1446258  1928347 2892516
sysctl: reading key "net.ipv6.conf.default.stable_secret"
net.ipv4.udp_rmem_min = 4096
net.ipv4.udp_wmem_min = 4096
net.core.netdev_max_backlog = 1000
net.ipv4.tcp_congestion_control = cubic


-PreTune
858783744 bytes (859 MB, 819 MiB) copied, 40.9906 s, 21.0 MB/s

-Tune (Sender Only)
858783744 bytes (859 MB, 819 MiB) copied, 43.407 s, 19.8 MB/s

-Tune again, Sender, Reciver, and Backlog, Congestion
858783744 bytes (859 MB, 819 MiB) copied, 13.4377 s, 63.9 MB/s

// reciver as cubix - 858783744 bytes (859 MB, 819 MiB) copied, 22.7711 s, 37.7 MB/s



TUNED OUT
echo 'net.core.wmem_default = 67187500' >> /etc/sysctl.conf
echo 'net.core.wmem_max = 140625000 ' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_wmem = 4096 67187500 140625000' >> /etc/sysctl.conf
echo 'net.core.rmem_default = 67187500' >> /etc/sysctl.conf
echo 'net.core.rmem_max = 140625000 ' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_rmem = 4096 67187500 140625000' >> /etc/sysctl.conf
echo 'net.core.netdev_max_backlog = 10000' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_congestion_control = scalable' >> /etc/sysctl.conf
sysctl -p




##CALCs
64 bytes from 119.9.54.84: icmp_seq=1 ttl=50 time=216 ms

!! - Estimated Default (Rackspace 80 Mb / s Server)
80000000 * 0.216 = 17280000 / 8 = 2160000 Bytes = 2.16MByte
! - Defaults should run at wire speeds. [did not]

##CALCS2
5,000,000,000 * 0.225 = / 8 = 140625000 = ~140MByte
(2,500,000,000 * 0.215) / 8 = 67187500 = ~68MByte