sysctl命令及sysctl.conf

chenshko

那位大神能帮我解释下， system("sysctl -w net.ipv4.route.secret_interval = 86400")的意思。

主要是net.ipv4.route.secret_interval的意义及作用。

各种baidu.google都查不到。

wangjianchangdx

This apparently has to do with /proc/sys/net/ipv4/route/secret_interval which defaults to 600 and controls periodic flushing of the route cache

The secret_interval instructs the kernel how often to blow away ALL route hash entries regardless of how new/old they are. In our environment this is generally bad. The CPU will be busy rebuilding thousands of entries per second every time the cache is cleared. However we set this to run once a day to keep memory leaks at bay (though we've never had one).

From: Tuning Linux IP routing parameters — secret_interval and tcp_mem

chenshko

明白了，3Q