Re: UDP jumbo packet loss on T2080RDB and out-of-order receive

[Bob Cochran <yocto@mindchasers.com>]

On 11/10/2015 11:17 AM, Clemens Eisserer wrote:
> Hi,
>
> I am trying to receive a stream of 9k jumbo frames on one of our
> T2080RDBs (simply using recvfrom), however even a very low rate
> (12MB/s on average) frequently UDP packages are lost. Furthermore the
> packets are received out-of-order e.g. :0, 8, 1, 2, 10, 3, 11, 4, 5,
> 6, .....
> While receiving the stream, I see an equal number of interrupts on
> QMAN-Portal0 through QMAN-Portal-7.
> PF_PACKET / PACKET_RX_RING for packet capturing also doesn't seem to
> work - is this unsupported by DPAA?
>
> So to summerize - any idea what could cause the following issues:
> * UDP jumbo packet loss
> * UDP jumbo packets are received out-of-order
>
> Thank you in advance, Clemens
>


Tracing is implemented for the DPAA. If you haven't done it already, you 
might want to enable it to get a better idea how each packet is being 
handled.  Once you get it working, it's pretty easy to add some 
additional fields and rebuild the kernel.

Events like dpa_rx_fd and dpa_tx_fd are supported and can be found in 
the dpa source directory under drivers.

There is also a Freescale DPAA Packet Tool that offers a free trial. 
It pretty much provides the same information as trace but with a GUI; 
however, it might require a JTAG TAP ( that's how I use it ).

Bob