Date: Sat, 01 Mar 1997 12:27:13 -0500 From: dennis <dennis@etinc.com> To: dg@root.com, Julian Assange <proff@iq.org> Cc: hackers@freebsd.org Subject: Re: optimised ip_input Message-ID: <3.0.32.19970301122709.00b1f390@etinc.com>
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At 08:21 AM 3/1/97 -0800, you wrote: >>ip_input() is appalling slow for multi-homed hosts, taking around >>2 x num_interface_addresses comparisons to detect if a packet is >>locally destined. >> >>I've addressed this with address caching, hashing, and intelligent >>handling of broadcast addresses. Interested? > > Certainly...I'd like to see the diffs... A better way of handing the overhead and the complexity issue is to keep local addresses in the routing table with a LOCAL flag. This eliminates the overhead altogether and simplifies the process: route=routelookup() if (route.flags & localflag) deal_withit_locally() else forward() You can argue that in some cases this is more overhead for locally destined packets, but in todays world (where routing speed is a primary concern) this is faster most of the time and makes life easier as it centralizes the structure dependencies. Just a thought. Dennis > >-DG > >David Greenman >Core-team/Principal Architect, The FreeBSD Project > >
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