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gig-ether--speedup-linux.sh

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+#!/bin/bash
+
+# http://fasterdata.es.net/host-tuning/linux/
+
+# increase TCP max buffer size setable using setsockopt()
+# 16 MB with a few parallel streams is recommended for most 10G paths
+# 32 MB might be needed for some very long end-to-end 10G or 40G paths
+sysctl net.core.rmem_max=16777216 
+sysctl net.core.wmem_max=16777216 
+# increase Linux autotuning TCP buffer limits 
+# min, default, and max number of bytes to use
+# (only change the 3rd value, and make it 16 MB or more)
+sysctl net.ipv4.tcp_rmem="4096 87380 16777216"
+sysctl net.ipv4.tcp_wmem="4096 65536 16777216"
+# recommended to increase this for 10G NICS
+sysctl net.core.netdev_max_backlog=30000
+# these should be the default, but just to be sure
+sysctl net.ipv4.tcp_timestamps=1
+
+# 1 to 0 per:
+# 
+sysctl net.ipv4.tcp_sack=0
+
+
+sysctl net.core.wmem_max=8388608
+#sysctl net.core.wmem_default=65536
+#sysctl net.core.rmem_default=65536
+sysctl net.core.wmem_default=131072
+sysctl net.core.rmem_default=131072
+sysctl net.ipv4.tcp_window_scaling=1
+sysctl net.ipv4.tcp_mem='98304 131072 196608'
+
+# determine interfaces found OTF xxx 2017.0319
+#for e in `ifconfig -a |grep flags |awk '{print $1}'`; do
+# fix for cubietruck 2019
+for e in `ifconfig -a |grep flags |awk -F: '{print $1}'`; do
+  ifconfig $e txqueuelen 5000
+#ifconfig eth1 txqueuelen 5000
+done
+
+ifconfig -a > /root/ifconfig-a.txt
+ip a >> /root/ifconfig-a.txt
+chmod 500 /root/ifconfig-a.txt
+
+# use faster usb wireless if connected
+#fwifi=`lsmod |grep -c rt2800usb`
+#[ "$fwifi" -gt 0 ] && /root/bin/boojum/wireless-commandline.sh &
+
+#http://datatag.web.cern.ch/datatag/howto/tcp.html
+#sysctl sys.net.core.netdev_max_backlog=2000 # unknown
+##sysctl net.ipv4.tcp_sack=0 
+