sysctl is a mechanism for controlling options and limits in the Unix-like operating system kernels. Sysctls can be used to tune performance or change behaviors of many subsystems.

learn more… | top users | synonyms

5
votes
3answers
3k views

Persisting nf_conntrack_max Across Reboots

In /proc I have two entries for nf_conntrack_max: /proc/sys/net/netfilter/nf_conntrack_max /proc/sys/net/nf_conntrack_max The seem to point to the same value as changing one also changes the ...
1
vote
1answer
5k views

Sysctl config for high performance, large activity

We have some server with a huge amount of visitors (every minute, every day). Basically we had a nice fine-tuned sysctl config for this purpose. (If you don't modify it, it starts to behave ...
3
votes
1answer
2k views

Increasing FreeBSD threads

For network apps that create one thread per connection (like Pound), threadcount can become a bottleneck on the number of concurrent connections you can server. I'm running FreeBSD 8 x64: $ sysctl ...
1
vote
1answer
2k views

File-descriptors setting on /etc/sysctl.conf

I have recently learnt that to be able to increase the amount of virtualhosts that we can serve via Apache depends on file-descriptors. they say the value should be added to /etc/sysctl.conf as ...
1
vote
1answer
739 views

net.inet.tcp.blackhole option on Fedora

This link of freebsdblog.org suggests a configuration option for FreeBSD that tells the system to drop all packages arriving from the network to a closed port and thus somewhat securing your system ...
98
votes
4answers
133k views

FreeBSD performance tuning: Sysctl parameter, loader.conf, kernel

I wanted to share knowledge of tuning FreeBSD via sysctl.conf / loader.conf / KENCONF / etc. It was initially based on Igor Sysoev's (author of nginx) presentation about FreeBSD tuning up to ...