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Date: Thu, 9 Dec 2004 15:48:31 +0000 (GMT)
From: Robert Watson <rwatson@freebsd.org>
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To: Andre Oppermann <andre@freebsd.org>
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cc: Ruslan Ermilov <ru@freebsd.org>
Subject: Re: cvs commit: src/sys/netinet in_gif.c
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On Thu, 9 Dec 2004, Andre Oppermann wrote:

> Ruslan Ermilov wrote:
> > 
> > On Tue, Dec 07, 2004 at 11:18:15AM +0100, Andre Oppermann wrote:
> > > I hope to remove the ability to have pointers into the routing table
> > > before 6.0 release.
> > >
> > This would make my WIP OBE, which is nice.  But how are you going to
> > compensate for the performance loss of *not* having cached routes?
> 
> Up to a couple of hundred kpps it doesn't matter and the only place
> where we have cached routes is in the various IP[46] tunnels.  The
> caching makes locking of the routing table more complex and expensive. 
> Once that can be simplified there is a significant amount of lookup cost
> going away. 

It is also my belief that the locking around the cached routes is
currently incorrect, and with that locking added, there will also be a
further hit. 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Principal Research Scientist, McAfee Research