Routing performance (Buffalo WZR-HP-G301NH)

[Adrian Chadd]

Hi!

Ok, so!

* the seiral console hurts a lot. Don't print stuff on the console
whilst testing.
* I've done a writeup on this when I dug into it a couple years ago.
https://adrianchadd.blogspot.com/



-adrian

On Fri, 4 May 2018 at 02:22, Josef Larsson <josef.lar at gmail.com> wrote:
>
> Hi,
>
> I would like to use the Buffalo WZR-HP-G301NH as a router with pf. I use
> a custom built ZRouter image for this. This works in practice, but I am
> not happy with the performance (I basically can't download faster than
> 80 mbit/s).
>
> I have a couple of concerns:
>
> 1. According to ps aux, there is an interrupt load at about 9 - 10 %
> during idle conditions. Is this reasonable? It seems high to me.
> 2. When I am running "pmcstat -TS instructions -w1", there seems to be a
> lot of action going on in uart_ar71xx_probe. Is this reasonable? There
> are some unknown functions, and I am suspect that the function names are
> not resolved correctly. Also, apb_attach is invoked a lot according
> pmcstat. While the sampling percentage for this function is less than 2
> %, I still find it odd that an attach function is invoked at idle...
> 3. When downloading a large file, the system becomes pretty much
> unresponsive. When a "ps aux" call actually goes through, one can see
> that the CPU is busy with ~100 % interrupt handling. This is what I
> would like to profile with pmcstat, but the arge functions do not show
> up as functions with high load, which is not really what I expect at
> this point, since the interrupt definitely has to do with the LAN load.
> Any suggestions on how to profile the arge driver?
>
> Best regards,
>
> Josef Larsson
>
>