Re: [LARTC] Linux router performance

From: Andreas John <lists@aj.net-lab.net>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Linux router performance
Date: Wed, 31 May 2006 20:27:10 +0000	[thread overview]
Message-ID: <447DFC1E.60007@aj.net-lab.net> (raw)
In-Reply-To: <004e01c684dc$3dfc3c10$303d5854@cttc.es>

Hi,

Maybe:
Khan, Sohel; Waheed, Abdul (2003): High Performance Routing on
PCshttp://www.ccse.kfupm.edu.sa/~sohel/networking/references/Routing.pdf

A rule of thumb:
- with current COTS hardware and (standard) PCI Bus, you can reach the
maximum of the PCI bus bandwidth. That's 1 GB/s, e.h. two NICs with  500
Meg/s each ( one in and one out )
- with PCI-X and in the future PCI-express you'll for sure be able to
reach more performance. I didnt find a sponsor for a test-lab yet :)
- in DoS secnarios it may get worse :/ I heavily depends on driver type
(polling and NAPI preferred). The problem with the performace is
_always_ the number of interrupts, nothing else is a bottleneck (well,
we didn't talk about thousands of iptables rules yet, but you ask for a
'maximum').
- The question you have to ask in high-performance scenarios is not
"MBit/s" but MPPS (megapackets per seconds). FreeBSD and Linux broke the
1 MPPS barrier some time ago (on dual xeons).

rgds,
Andreas

Fermín Galán Márquez wrote:
> Hi,
> 
> I wonder about the performance of a Linux box used as router (I guest I'm
> not the first :). Althought I know it mainly depends on the hardware, I'm
> trying to find some references on the topic or comparations with other
> routing solutions (FreeBSD box used as router, Cisco, etc). For example,
> http://facweb.cti.depaul.edu/jyu/Publications/Yu-Linux-TSM2004.pdf
> (althought is related with Linux-briding more than with Linux-routing) shows
> in Figure 14 that with an AMD Duron 1.3GHz 512M RAM a throughput of 90 Mbps
> can be achieved.
> 
> Anybody knows any other similar analysis, please?
> 
> Best regards,
> 
> --------------------
> Fermín Galán Márquez
> CTTC - Centre Tecnològic de Telecomunicacions de Catalunya
> Parc Mediterrani de la Tecnologia, Av. del Canal Olímpic s/n, 08860
> Castelldefels, Spain
> Room 1.02
> Tel : +34 93 645 29 12 
> Fax : +34 93 645 29 01
> Email address: fermin.galan@cttc.es 
> 
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