Re: [dpdk-dev] Please any one who can help me with librte_sched

[Stephen Hemminger <stephen@networkplumber.org>]

On Tue, 27 May 2014 10:33:02 -0300
Ariel Rodriguez <arodriguez@callistech.com> wrote:

> Hello , this is my third mail , the previous mails have not been answered
> yet.
> 
> I justo need someone explains to me  how the librte_sched framework behaves
> in a specific situation.
> 
> I have a managment application , this connects with a ring with the tx
> core, when a user applies some configuration of the bandwith mangement ,
> the tx core read the message in the ring parse the configuration in a
> rte_port_params struct , subport_params and pipe_params, then creates a new
> rte_sched from scratch , and then changes the pointer of the current
> rte_sched_port currently doing scheduling and then the code execurte
> rte_sched_port_free() for the unreference (reference by temporal pointer)
> rte_sched_port . This is the only way i found for applying dinamic
> configuration or changes to the qos framework.
> So, with this, what happens with the packets attached to the old
> rte_sched_port while is deleted? are those lost packets inside the
> rte_sched_port generates memory leaks?  how can i recover this packets _
> just dequeing from the port scheduler? Where the port scheduler  indicates
> empty packets in the queu state?
> 
> Is there a better way to achieve this kind of behaviour? i just need to
> update  the rte_sched_port configuration dinamically, and i want to change
> the current pipe configuration and sub port configuration also.
> 
> Regards .

If you need to do dynamic changes, I would recommend using an RCU type
algorithm where you exchange in new parameters and then cleanup/free
after a grace period.  See http://lttng.org/urcu