two NIC on 2 core system (scheduling problem)

[Bartosz Giza]

Tuesday 28 of October 2008 12:29:54 Ivan Voras napisał(a):
> Bartosz Giza wrote:
> > Tuesday 28 of October 2008 11:49:21 Oleksandr Samoylyk napisał(a):
> >> Ivan Voras wrote:
> >>> Bartosz Giza wrote:
> >>>> Another question is why em0 taskq is eating so much cpu ? BGE
> >>>> interface is actually one that pushes 2 times more packets than em0
> >>>> and it uses about half cpu comparing to em0. Is that not strange ?
> >>>> Could someone tell my why is this happening ? BGE is faster ? or
> >>>> maybe i can tune some
> >>>
> >>> I have the same problem - em0 taskq eating incredible amounts of CPU.
> >>> If you find a solution, contact me!
> >>
> >> It could be not just a problem with em driver.
> >> Firstly, it's good to make profiling and find out what exactly eats
> >> CPU time.
> >
> > Yes, we should make some profiling, but it is quite hard on busy
> > production router. When i turn on pooling on em0 card swi1: net is
> > using about 3% of cpu. So it is quite big difference between  20% with
> > tasq and 3% with polling.
>
> Is the difference reflected in your system / idle CPU time? (i.e. does
> your idle time increase for ~~ 17%?)

Yes exactly my idle time is increasing ~17%
For now i am not using polling But i am preparing the same machine for much 
more bussier router and i am not sure that this router with em cards will 
suffice.