If you have a Gig connection on your Linux server, your O/S might be robbing you of power. Try this out to start with, if it doesn’t work, reboot and your server will default back to their original settings sysctl -w net.core.rmem_max=8388608sysctl -w net.core.wmem_max=8388608sysctl -w net.core.rmem_default=65536sysctl -w net.core.wmem_default=65536sysctl -w net.ipv4.tcp_rmem=’4096 87380 8388608′sysctl -w net.ipv4.tcp_wmem=’4096 65536 […]
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Sorry, it’s been a while since I posted. I’ll be updating the site with more techie related stuff as I re-organize my tech notes once more.
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As time goes on, life can be a little hectic. I am currently facing a bit of a financial crisis and ask that if anyone has any projects they need done on the side to let me know. You can e-mail me email@example.com As always, any donations are helpful as I go through this rougher […]
According to RedHathttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/performance_tuning_guide/s-memory-transhuge I usually use THP and this can be enabled very easily within the running system by issuing echo always > /sys/kernel/mm/transparent_hugepage/enabledecho always > /sys/kernel/mm/transparent_hugepage/defrag With the above I always set the nr_hugepages to 512 or for smaller systems 128. echo 512 > /proc/sys/vm/nr_hugepages
echo 1 > /proc/sys/net/ipv4/tcp_syncookies echo 45 > /proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv echo 3 > /proc/sys/net/ipv4/tcp_synack_retries echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle I tried to use these common values to help deter a syn flood from occurring. Syn-cookies challenges the other opponent. While you change the default timing of syn_recv from 60 seconds to 45 seconds which […]
This dirty last ditch modification to the kernel will force close connections after so many seconds. The default is 60. echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout This will tell everyone that you have 30 seconds to finish or else I will drop your connection. This is good in a pinch, but do not recommend running this at […]