[dpdk-dev] [PATCH v4 1/7] ethdev: allocate max space for internal queue array

[Ananyev, Konstantin]

> > At queue configure stage always allocate space for maximum possible
> > number (RTE_MAX_QUEUES_PER_PORT) of queue pointers.
> > That will allow 'fast' inline functions (eth_rx_burst, etc.) to refer
> > pointer to internal queue data without extra checking of current number
> > of configured queues.
> 
> What is the memory usage overhead per port?

(2*sizeof(uintptr_t))* RTE_MAX_QUEUES_PER_PORT
With RTE_MAX_QUEUES_PER_PORT==1024 (default value) it is 16KB per port. 

> We should consider cases with thousand of virtual ports.

For 1K ports (with 1K queues each) it will be 16MB.