[dpdk-users] mbuf free cnt not decreasing

[Javier Coleto Fernández]

2016-04-18 18:29 GMT+02:00 Wiles, Keith <keith.wiles at intel.com>:

> >Javier,
> >That was just our guess, you might have the leak somewhere else...
> >
> >Andriy
> >
> >On Mon, Apr 18, 2016 at 6:01 PM, Javier Coleto Fernández
> ><javicoleto44 at gmail.com> wrote:
> >> This is exactly what I'm doing at the moment, but the free count (both
> the
> >> rte_mempool_free_count() and rte_ring_free_count()) keeps increasing
> >> nonetheless.
>
> Check to make sure you are not increasing the reference count in the mbuf,
> these two are the most common places to lose packets.


I don't make any call to reference count changing functions (like
rte_mbuf_refcnt_update/set) but, is there any other way this reference
count could end up having a "bad" value?

Also check your loops to make sure you are not breaking out of the packet
> processing loops too soon and skipping some packets. In one case I have
> seen someone converted a while loop into a for loop and forgot to remove
> the i++ some place in the body of the code. Try adding counter on your code
> to see if you are missing processing or freeing the packets.


> I would not expect the DPDK code to be the problem, so focus on your code
> is all I can tell you.
>
> >>
> >> Regards,
> >> Javier
> >>
> >> 2016-04-18 17:57 GMT+02:00 Andriy Berestovskyy <aber at semihalf.com>:
> >>>
> >>> On Mon, Apr 18, 2016 at 5:34 PM, Javier Coleto Fernández
> >>> <javicoleto44 at gmail.com> wrote:
> >>> > Basing on what you say, is that return value supposed to be less than
> >>> > 'n' in
> >>> > case the ring is filled up or do I have to check the ring size before
> >>> > calling rte_eth_tx_burst()?
> >>>
> >>> You just have to check the return value and free the unsent mbufs.
> >>> Here is an example:
> >>>
> >>> ret = rte_eth_tx_burst(port, queueid, m_table, n);
> >>> if (unlikely(ret < n)) {
> >>>     do {
> >>>         rte_pktmbuf_free(m_table[ret]);
> >>>     } while (++ret < n);
> >>> }
> >
>
>
> Regards,
> Keith
>

Regards,
Javier