Hi Zoltan,
On Fri, May 29, 2015 at 7:00 PM, Zoltan Kiss <zoltan.kiss at linaro.org> wrote:
> The easy way is just to increase your buffer pool's size to make
> sure that doesn't happen.
Go for it!
> But there is no bulletproof way to calculate such
> a number
Yeah, there are many places for mbufs to stay :( I would try:
Mempool size = sum(numbers of all TX descriptors)
+ sum(rx_free_thresh)
+ (mempool cache size * (number of lcores - 1))
+ (burst size * number of lcores)
> I'm thinking about a foolproof way, which is exposing functions like
> ixgbe_tx_free_bufs from the PMDs, so the application can call it as a last
> resort to avoid deadlock.
Have a look at rte_eth_dev_tx_queue_stop()/start(). Some NICs (i.e.
ixgbe) do reset the queue and free all the mbufs.
Regards,
Andriy
