Re: [dpdk-dev] Inconsistent statistics counters for pmd_i40e

["Eimear Morrissey" <eimear.morrissey@ie.ibm.com>]

Arnon Warshavsky <arnon@qwilt.com> wrote on 10/19/2015 03:01:46 PM:

> From: Arnon Warshavsky <arnon@qwilt.com>
> To: Eimear Morrissey/Ireland/IBM@IBMIE
> Cc: dev@dpdk.org
> Date: 10/19/2015 03:01 PM
> Subject: Re: [dpdk-dev] Inconsistent statistics counters for pmd_i40e
>
> Hi Eimear,
>
> I just experienced the same problem with firmware versions 4.23 and
> 4.33 (dpdk 2.0). Did not get to try the latest which is 4.5.
> Looking at the code, I don't see that this counter is being read any
> differently than its peer counters and I suspect the nic itself.
> Can you tell which firmware version you were using?
>
> thanks
> /Arnon
>
> On Mon, Oct 19, 2015 at 2:43 PM, Eimear Morrissey
<eimear.morrissey@ie.ibm.com
> > wrote:
>
>
> Hi,
>
> I'm having issues measuring packets dropped at the NIC in both the 2.0.0
> and 2.1.0 versions of DPDK on an X710 Intel NIC.
>
> In dpdk-2.0.0
> Using rte_eth_xstats the rx_packets and rx_bytes counters increase as
> expected, however rx_missed_errors is always 0 even if a sleep statement
is
> added between calls to rte_eth_rx_burst. However changing the coremask so
> the application is running on a different socket than the card will cause
> rx_missed_errors to increment for a limited amount of time and then stop.
> Using rte_eth_stats, ipackets is incremented on packet receipt but the
> q_ipackets and q_errors arrays remain zero. Even crossing sockets seems
to
> have no effect on q_errors.
>
> In dpdk-2.1.0 the behaviour is the same as above, except that the number
of
> fields returned by rte_eth_xstats_get is reduced (no rx_missed errors at
> all) so running on a different socket no longer has any noticeable effect
> on the stats.
>
> My understanding from the API manual is that the rte_eth_stats q_errors
> array should count the packets missed because software isn't polling fast
> enough, but that doesn't seem to be the case? Is there a standard DPDK
way
> to check this? The application is a forwarding one so there's no other
way
> to estimate drop except through NIC rx.
>
> Thanks,
> Eimear
>
>
>
> --
>
> Arnon Warshavsky
> Qwilt | work: +972-72-2221634 | mobile: +972-50-8583058 | arnon@qwilt.com

Hi Arnon,

The firmware version I'm using is 4.26. Where do you see the latest is 4.5
- I can't find anything obvious in the download centre?

Regards,
Eimear