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Re: Route cache performance under stress

To: Simon Kirby <sim@xxxxxxxxxxxxx>
Subject: Re: Route cache performance under stress
From: Ralph Doncaster <ralph@xxxxxxxxx>
Date: Mon, 9 Jun 2003 23:18:45 -0400 (EDT)
Cc: Jamal Hadi <hadi@xxxxxxxxxxxxxxxx>, CIT/Paul <xerox@xxxxxxxxxx>, "'David S. Miller'" <davem@xxxxxxxxxx>, "fw@xxxxxxxxxxxxx" <fw@xxxxxxxxxxxxx>, "netdev@xxxxxxxxxxx" <netdev@xxxxxxxxxxx>, "linux-net@xxxxxxxxxxxxxxx" <linux-net@xxxxxxxxxxxxxxx>
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On Mon, 9 Jun 2003, Simon Kirby wrote:

> "vmstat 1") except in attack cases.  The difference is probably just the
> fact that this is running on slightly faster hardware (single Athlon
> 1800MP, Tyan Tiger MPX board).

What happened to Linux users being able to brag about how much they could
do with CPUs that were useless for running Windows?  On a 1Ghz CPU you've
got almost 7,000 cycles to route a packet in order to handle 148kpps.  I
can't see why the slow path should be more than 2,000 cycles.

I know some people's attitude is don't talk if you're not going to write
the code.  If I had the time I would; from my earliest days of programming
I've been optimizing performance to the maximum.  I can still remember
using page 0 on my c64 to store an 8-bit register in 3 cycles instead of

So to put a stake in the ground, I'd like to see a 1Ghz celeron with e1000
cards handle 148kpps of DOS traffic at <50% CPU utilization (with full
routing tables & no firewalling).  If that's not a reasonable expectation,
someone please let me know.  Even if my time was only worth $500/day, in
the past year and a half I spent enough time working on Linux routers to
buy a Cisco NPE-G1. :-(


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