[dpdk-dev] dpdk - poll mode - context switches

[Bruce Richardson]

On Wed, Feb 25, 2015 at 10:54:51AM +0100, Jog Lie wrote:
> Hello,
> 
> I am not sure to understand the mechanism behind dpdk concerning the context switches.
> I have two user space applications that need access to the NIC according to incoming port rules (port 80 and port 443).
> 
> How to be sure that DPDK spreads the load to the right application ? 
> 
> Will 2 dpdk instances be needed (one per app) -> two incoming packets analysis to "know" if the packet should be forwarded to 
> the user space process ? Which would basically be the same thing as inefficient promiscuous mode.
> 
> i don't understand that "filtering" point.
> 
> Could you please clarify ?
> 
> Thanks
> 
> -- 
> Jog

Hi Jog,

The missing link in connecting applications which receive packets from port
80/443 and DPDK itself is the TCP/IP stack in use. DPDK itself does not include
any stack, so you'll need to select a stack to use with your applications. The
mechanics of how apps talk to ports and how traffic gets filtered to them is
largely the stack's responsibility.

/Bruce