[CentOS] Desperately need help with multi-core NIC performance

Rob Kampen rkampen at kampensonline.com
Wed Feb 24 21:02:05 UTC 2010

Pete Kay wrote:
> Hi,
> I am running a VOIP application on Centos 5.3.  It is a 16 core box
> with 12 G of mem and all what it does is passing packets.
> What happens is that at around 2K channels running g711 ( 64k) codec,
> all eth0 is used up and no more traffic can go through.
So that's about 128Mbits per second not counting UDP packet overheads
I guesstimate that you cannot get much more than that through a 1G 
ethernet NIC - it is not CP bound, rather you are nearing the capacity 
of a single NIC.
> I have checked google and it talked about interrupt scheduler.
> does anyone know how to configure the kernel to allow it to use all
> CPSs for socket transmission of UDP packets?
> Any pointer will be greatly appreciated.
> pete
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