Re: [mpls-linux-general] mpls-linux performance

[Adrian P. <adr...@gm...>]

I remember I did some performance tests a few years ago, and the major
speed boost was turning debugging off (speed increase from ~3-4Mbps to
70-80Mbps).

In practice I would expect performance to be slightly lower than IPv4 over
the same hardware. In theory you would get better performance because of
lower lookup tables, but that only applies on specialized ASICs, not on
general purpose computers that do things in software.

Also, you might have some performance increase if you try to forward
traffic for a large destination routing table - e.g. try to populate the
routing table with as many routes as you can and measure the routing time
for random destination packets, and compare it to switching mpls packets
(on a P router) with an equally large label table. For PE routers,
performance will be lower, because it needs to do IP lookup to identify the
mpls rules to apply, so it will take longer.

Hope it helps,

Regards

On Tue, Jul 31, 2012 at 10:18 AM, George Xilouris <
xil...@ii...> wrote:

> Dear all,
>
> I have made some preliminary tests with mpls on kernel 2.6.35.13 which is
> the last kernel released for mpls-linux for Kernel 2.6 version. I have
> noticed the following:
>
> 1. The performance depends on the ethernet card driver and chipset,
> currently best performance achieved with Broadcom cards
> 2. The Non-Loss forwarding capability of an LSR router is around 90Mbps
> for full length UDP packets. The experiments were made with Gigabit cards.
> 3. Kernel messages were so often (i had mpls debug disabled) that I had to
> stop the rsyslogd in order not to spend CPU cycles.
> 4. I increased UDP system memory by modifying the kernel defaults under
> /proc/sys, no change in the actual performance was observed.
>
> So here comes the question, does anyone have any performance numbers or
> rules of thumb to propose ? What is the best forwarding performance that  I
> could expect?
>
> Best Regards
> George Xilouris
> --
> [image: Demokritos Site] <http://www.iit.demokritos.gr/>
>
>
> *George K. Xilouris*
> Associate Researcher
> NCSR Demokritos
> Institute of Informatics and Telecommunications
> P.O. Box 60228
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>
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