On Sun, May 29, 2011 at 10:33 AM, Eric Dumazet <eric.dumazet@gmail.com> wrote:

Le dimanche 29 mai 2011 à 10:07 -0600, Dave Taht a écrit :

>
>
> On Sun, May 29, 2011 at 9:51 AM, Juliusz Chroboczek
> <jch@pps.jussieu.fr> wrote:
> >> Are you seeing high CPU load in interrupt context? (Run
> top.)
>
> > Yes. 99% sirq.
>
>
> Could be due to a simplistic Ethernet driver. If you have the
> time and
> energy, you may want to ask on dev.openwrt.org.
>
> I will have some energy and time, shortly.
>
> That said, several great openwrt people are on this list, and may be
> able to weigh in.
>
> I'm glad that the limit of about 130Mbit on the ethernet side for gigE
> could be mitigated with a better driver. (and that said, 130Mbit is
> "good enough" for most of the world)
>

Hmm, 130 Mbits sound very low. What linux version is it, and what the
driver is exactly, so that I take a look ?

The ethernet driver is the ag71xx driver as present in the wndr3700v2 (and mucho related atheros hardware). Regrettably so far as I can tell, this one is out of tree, and is incorporated in the openwrt build via a string of patches.

https://dev.openwrt.org/browser/trunk/target/linux/ar71xx/files/drivers/net/ag71xx

I think.

Gabor sent patches for it to me for ethtool that I have not yet tried.

The kernel being used in capetown[1] is 2.6.37.6. - patched forward from 2.6.39 for the pfifo ecn bug, the ipv6 ecn bug, and several other bufferbloat related things like sfb...