Bernat: Tuning the Linux IPv4 route cache

[Posted December 14, 2011 by corbet]

Vincent Bernat has posted a lengthy description of how the IPv4 routing cache works and how to tune it for best results. "Once an entry has been added to the route cache, there are several ways to remove it. Most entries are removed by the garbage collector which will scan the route cache and remove invalid and older entries. It will be triggered when the route cache is full or at regular interval, once a certain threshold has been met." (Thanks to Paul Wise).

Bernat: Tuning the Linux IPv4 route cache

Posted Dec 15, 2011 4:20 UTC (Thu) by shemminger (subscriber, #5739) [Link]

Great people will finally know how to tune it before it gets killed! http://vger.kernel.org/netconf2011_slides/davem_netconf2011.pdf

thanks for the documentation the route cache is important

Posted Dec 22, 2011 10:19 UTC (Thu) by renox (guest, #23785) [Link]

I remember trying to do fast fail over from one interface to the other and the transition was slowed down a lot because of the route cache and the documentation was very scarce.