Re: Ethernet bridge performance

[Felix Radensky <felix@xxxxxxxxx>]

Hi, Jamal

I guess you were not reading my first posting 
very carefully :)

2.4.22 has NAPI capable e1000 driver and I've
compiled the driver with NAPI support. 

So running non-NAPI driver is not my problem.

Felix.

jamal wrote:
> Actually seems his biggest problem is he is not running
> the NAPI driver
>
> cheers,
> jamal
>
> On Thu, 2003-08-07 at 15:09, Robert Olsson wrote:
> > Felix Radensky writes:
> >  > Thanks for your help, Ben. What is skb-recycle patch
> >  > and where can I find it ?
> >  
> >  It's experimental and not updated for almost a year and current 
> >  implementation does not add anything to SMP. Got some idea how
> >  to improve this... but try to keep to slab as long as possible 
> >  it has been improved.
> >
> >  Routing/bridging on SMP has affinty problem. If you are passing
> >  skb's say from eth0 to eth1 and they are bound on different CPU's
> >  you get cache boucing since the TX-interrupts come on another CPU.
> >
> >  In a recent test with pktgen:
> >  300 kpps with TX interrupts on same CPU as sender.
> >  198 kpps with TX intr on different CPU as sender.
> >
> >  Recycling tries to address this but current implementation fails
> >  as said.
> >
> >  But you are probably hit by something else... Check were the drops 
> >  happens qdisc?. NIC ring RX/TX size, Number of interrupts. ksoftird 
> >  priority, link HW_FLOW control, checksumming, affinity etc. 
> >
> >  
> >  Cheers.
> > 						--ro
> >
> >
> >