configuration issues Home Page › Forums › Network Management › Linux and Networking › configuration issues This topic contains 1 reply, has 0 voices, and was last updated by jagsph 8 years, 9 months ago. Viewing 1 post (of 1 total) Author Posts December 8, 2010 at 7:24 pm #42772 jagsphMember Even with these changes the system is dropping some tcp connections randomly for no apparent reason. Plenty of memory available, and no errors passed to syslog or dmesg. IE: Tries connecting and then is unable to establish a connection. First 1-3 times. old kernel version appears to causes some issues: e1000 driver is buggy and csum doesnt work properly causing mostly tcp connections to fail performance improved with: ethtool -K ETH00 rx off ethtool -K ETH00 tx off System ran out of buffer space very fast, recommend the following changes to next release. Or maybe something more conservative. echo 65535 > /proc/sys/net/ipv4/neigh/default/gc_thresh1 echo 65535 > /proc/sys/net/ipv4/neigh/default/gc_thresh2 echo 65535 > /proc/sys/net/ipv4/neigh/default/gc_thresh3 sysctl -w net.core.somaxconn=65535 sysctl -w net.ipv4.tcp_syncookies=1 sysctl -w net.ipv4.tcp_max_syn_backlog=65535 Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.