[dpdk-dev] librte_pmd_ixgbe implementation of ixgbe_dev_rx_queue_count

[Lu, Wenzhuo]

Hi Mohammad,


> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Mohammad El-Shabani
> Sent: Tuesday, March 29, 2016 9:45 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] librte_pmd_ixgbe implementation of
> ixgbe_dev_rx_queue_count
> 
> Hi,
> Looking into why it hurts performance, I see that ixgbe_dev_rx_queue_count is
> implemented a scan of elements of rx descriptors, which is very expensive. I am
> wondering why its implemented the way it is. Could it not just read the head
> location from the driver?
Not sure about the history. But to my opinion it's a control plane ops not a data plane ops. Maybe the reason is the author doesn't care about the performance too much.
As you have a good idea, would you like to share it with us? Thanks in advance:)

> 
> Thanks!
> Mohammad El-Shabani