[Click] click optimize efficiency

[Cliff Frey]

Your config looks reasonable to me.

How are you measuring performance?  I know if you are running TCP on the
devices as well (if you are testing tcp-to-the-device rather than forwarding
perfomance) that can slow things down (because of TCP checksumming and
because linux will keep a copy of every packet, causing there to be a lot
more memcpy overhead).

Also, often the drivers contribute a lot of the slowdown, even though this
is very hard to measure/see.

It also seems as though you are using a br-lan device from linux, perhaps
the linux bridge code isn't very fast as well.

You can benchmark click by loading the same config, but with an
InfiniteSource instead of a FromHost or FromDevice, and a Discard instead of
a ToHost/ToDevice, and seeing what performance you get there.  That can give
you a benchmark for the maximum possible speeds that you will see with
click.  If that number is very high, then you need to be optimizing your
drivers or linux.  If the number is low, then the problem probably is in
click.

I know from experience that it is possible to forward more than 140Mbps
using kernel click with linux on a mips board in the 600-800 MHz range.

Cliff

On Tue, Nov 24, 2009 at 1:48 AM, Yongheng Qi <jetever at gmail.com> wrote:

> Click performance is so poor. I only use 3 classifier and 1 iprewrite and
> other general packet process elements.
>
> At 680Mhz MIPS CPU, click actually can't process over 90Mbit data per
> second.
>
> The attachment is the click config file. anyone can tell me how to optimize
> it.
>
> Thanks very much
>
>
> 2009/11/20 Yongheng Qi <jetever at gmail.com>
>
> > Dear everyone.
> >
> > I use click roofnet process the 802.11n packet. test it use IxChariot.
> find
> > about 90Mbps, click use 100% cpu.
> >
> > I use routeros 433AH boardband.the cpu is MIPS 680Mhz.
> >
> > I don't know how to make click have more eiffciency.
> >
> > please help me, Thanks very much.
> >
> > --
> > Yongheng Qi
> >
> > Mobile: +86 1390 119 7481
> >
>
>
>
> --
> Yongheng Qi
>
> Mobile: +86 1390 119 7481
>
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