Tuning a FreeBSD Router

This is a work in progress mini howto. More informations will be added later. Also some aspects are about optimizing a pppoe server built with mpd. If you've build a router with FreeBSD to serve a huge number of lan users some sysctl tunings can be done: Add the following options to /etc/sysctl.conf kern.polling.enable=1 kern.ipc.nmbcluster=32768 kern.ipc.maxsockbufs=2097152 kern.ipc.somaxconn=8192 kern.maxfiles=65536 kern.maxfilesperproc=32768 net.inet.tcp.delayed_ack=0 net.inet.tcp.sendspace=65535 net.inet.udp.recvspace=65535 net.inet.udp.maxdgram=57344 net.local.stream.recvspace=65535 net.local.stream.sendspace=65535 To be able to activate device polling you must recompile kernel with options DEVICE_POLLING and also your nic driver must support polling. Also add the following options to /boot/loader.conf if you use pppoe server with mpd: net.graph.maxalloc=512 net.graph.maxdgram=45000 net.graph.recvspace=45000 If you do not increase net.graph.maxdgram and net.graph.recvspace variables you will not be able to connect more than 130 pppoe users (with mpd). If you've built your traffic shaper with pf packet filter and you use ALTQ HFSC algorythm you will have increase the maximum number of queues permitted by HFSC algorythm: Edit file: /sys/contrib/altq/altq_hfsc.h Modify #define HFSC_MAX_CLIENTS 64 to #define HFSC_MAX_CLIENTS 500 And remember that HFSC is a linear algorythm, it will work fine for hundreads of queues but not for thousands.

 

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