[dpdk-dev] Eventdev DSW and eth_rx_adapters

Mattias Rönnblom mattias.ronnblom at ericsson.com
Wed Dec 19 21:02:48 CET 2018


On 2018-12-19 19:37, Venky Venkatesh wrote:
> 
> 
> On 12/18/18, 10:53 PM, "Mattias Rönnblom" <mattias.ronnblom at ericsson.com> wrote:
> 
>      On 2018-12-18 02:46, Venky Venkatesh wrote:
>      > Hi,
>      > I am relatively new to DPDK and am trying to use the eventdev library.
>      > The sw_evdev runs on a single core (service core). And then there is rte_event_eth_rx_adapter_ which links the sw_evdev to the ethdev. This adapter is also service core based. The DSW runs on all cores – and thus doesn’t use service cores. If we use the existing adapter, in the DSW paradigm:
>      >
>      >    *   The benefit of DSW is diminished as the packets would first have to go thru a possible choke point viz. the service core.
>      
>      Yes, but the practical implications may not be as great as you think. A
>      single service core will be able to handle (e.g. relay) a fair amount of
>      events into/out-of an event device.
>      
>      You are however not forced to use service cores. You may use one or more
>      of your workers to feed an event device.
> 
> [VV]: Just to be sure we are on the same page: The workers in a sort of alternating fashion call the ethdev to dequeue and enqueue_new into the eventdev and of course the dequeue from the eventdev (sort of analogous to the code that you provided with integrated producer and consumer).

Yes.


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