[plug] PPPoE tuning

Tomasz Grzegurzko tomasz_g at arach.net.au
Fri Dec 16 19:14:25 WST 2005

Quoting Bernd Felsche <bernie at innovative.iinet.net.au>:

> Tomasz Grzegurzko <tomasz_g at arach.net.au> writes:
> >Quoting Bernd Felsche <bernie at innovative.iinet.net.au>:
> >> I've recently connected to ADSL2+. My newer firewall is a Pentium
> >> MMX @ 200MHz with "minimal" SuSE 10.0 and shiny new kernel installed.
> >> The firewall is running rp-pppoe and it's maxed out on CPU at about
> >> 14,000 kbps.  Most of the CPU usage is in kernel mode so it's
> >> obviously doing important stuff in the ppp module.
> >> Is there any obvious tuning that I could be doing?
> >Are you sure its actually running in kernel mode and not user mode?
> The SuSE doc says that the pppoe uses kernel mode. Under load, only
> about 20% is in user space and 80% in kernel.
> >rp-pppoe takes a bit of work to get running in kernel mode; I didn't see
> any
> >difference once I got it going in kernel space (but I'm on 256/64).
> I read that there are some tuning options in the documentation but
> don't yet understand which ones will have the best effect.
> -- 

So when the link is down; you see a drop in the load?
I just wonder if its something other than pppoe - a net card perhaps?
(in which case you may try enabling NAPI for example).


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