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Cc: Pawel Tyll <ptyll@nitronet.pl>, lev@freebsd.org,
	"Alexander V. Chernikov" <melifaro@freebsd.org>,
	freebsd-net@freebsd.org, freebsd-ipfw@freebsd.org,
	Luigi Rizzo <rizzo@iet.unipi.it>
Subject: Re: Firewall Profiling.
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On 27 December 2011 22:32, Juli Mallett <jmallett@freebsd.org> wrote:

> Reloading of mbufs into DMA descriptors? =A0mbuf allocator overhead
> itself? =A0Interrupts. =A0Context switches under constant heavy load.
> Some indirection in the network stack.

Keeping caches primed? Not doing lots of very-deep-stack stuff for
each packet, which is the bane of all current kernel-space UNIX
implementations of frame forwarding? :)


Adrian