netdev - Re: [ANNOUNCE]: First release of nftables

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Date:	Wed, 18 Mar 2009 14:00:16 +0200 (EET)
From:	Meelis Roos <mroos@...ux.ee>
To:	Patrick McHardy <kaber@...sh.net>
cc:	netdev@...r.kernel.org
Subject: Re: [ANNOUNCE]: First release of nftables

> Data is represented in a generic way inside the kernel and the
> operations are defined on the generic data representations, meaning
> its possible to use any matching feature (ranges, masks, set lookups
> etc.) with any kind of data. Semantic validation of the operation is
> performed in userspace, the kernel doesn't care as long as the
> operation doesn't potentially harm the kernel.

This sounds like a "script" downloaded to kernel and interpreted during 
each packet match. This toubles me some - doesn't this use more memory 
accesses to achieve the same work that was done in precompiled code 
before?

Have you measured the fastpath performance of kernel matching of real-life 
rulesets, compared to iptables?

-- 
Meelis Roos (mroos@...ux.ee)
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