From mboxrd@z Thu Jan 1 00:00:00 1970 From: Megh Bhatt Subject: Question about Linux routing - ip_route_output_key vs fib_lookup Date: Wed, 16 Feb 2005 12:35:57 -0500 Message-ID: <5d1f895705021609356e34aeec@mail.gmail.com> Reply-To: Megh Bhatt Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit To: netdev@oss.sgi.com Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org Hi, I had a question about Linux routing functions, suppose I want to find out what interface does a route to an IP address belong to - is it better (in terms of performance) to use ip_route_output_key or fib_lookup. My initial guess from looking at the source code is fib_lookup since the routing cache wont be helpful since I wont have any interface information (rather want to find out interface information) but wanted to be sure. Thanks. Megh