[dpdk-dev] i40e: problem with rx packet drops not accounted in statistics

Martin Weiser martin.weiser at allegro-packets.com
Wed Oct 21 10:44:20 CEST 2015


Hi Helin,

any news on this issue? By the way this is not just a problem with
statistics for us but also a performance problem since these packet
discards start appearing at a relatively low bandwidth (~5GBit/s and
~1.5Mpps).

Best regards,
Martin

On 10.09.15 03:09, Zhang, Helin wrote:
> Hi Martin
>
> Yes, the statistics issue has been reported several times recently.
> We will check the issue and try to fix it or get a workaround soon. Thank you very much!
>
> Regards,
> Helin
>
>> -----Original Message-----
>> From: Martin Weiser [mailto:martin.weiser at allegro-packets.com]
>> Sent: Wednesday, September 9, 2015 7:58 PM
>> To: Zhang, Helin
>> Cc: dev at dpdk.org
>> Subject: i40e: problem with rx packet drops not accounted in statistics
>>
>> Hi Helin,
>>
>> in one of our test setups involving i40e adapters we are experiencing packet
>> drops which are not reflected in the interfaces statistics.
>> The call to rte_eth_stats_get suggests that all packets were properly received
>> but the total number of packets received through rte_eth_rx_burst is less than
>> the ipackets counter.
>> When for example running the l2fwd application (l2fwd -c 0xfe -n 4 -- -p
>> 0x3) and having driver debug messages enabled the following output is
>> generated for the interface in question:
>>
>> ...
>> PMD: i40e_update_vsi_stats(): ***************** VSI[6] stats start
>> *******************
>> PMD: i40e_update_vsi_stats(): rx_bytes:            242624340000
>> PMD: i40e_update_vsi_stats(): rx_unicast:          167790000
>> PMD: i40e_update_vsi_stats(): rx_multicast:        0
>> PMD: i40e_update_vsi_stats(): rx_broadcast:        0
>> PMD: i40e_update_vsi_stats(): rx_discards:         1192557
>> PMD: i40e_update_vsi_stats(): rx_unknown_protocol: 0
>> PMD: i40e_update_vsi_stats(): tx_bytes:            0
>> PMD: i40e_update_vsi_stats(): tx_unicast:          0
>> PMD: i40e_update_vsi_stats(): tx_multicast:        0
>> PMD: i40e_update_vsi_stats(): tx_broadcast:        0
>> PMD: i40e_update_vsi_stats(): tx_discards:         0
>> PMD: i40e_update_vsi_stats(): tx_errors:           0
>> PMD: i40e_update_vsi_stats(): ***************** VSI[6] stats end
>> *******************
>> PMD: i40e_dev_stats_get(): ***************** PF stats start
>> *******************
>> PMD: i40e_dev_stats_get(): rx_bytes:            242624340000
>> PMD: i40e_dev_stats_get(): rx_unicast:          167790000
>> PMD: i40e_dev_stats_get(): rx_multicast:        0
>> PMD: i40e_dev_stats_get(): rx_broadcast:        0
>> PMD: i40e_dev_stats_get(): rx_discards:         0
>> PMD: i40e_dev_stats_get(): rx_unknown_protocol: 167790000
>> PMD: i40e_dev_stats_get(): tx_bytes:            0
>> PMD: i40e_dev_stats_get(): tx_unicast:          0
>> PMD: i40e_dev_stats_get(): tx_multicast:        0
>> PMD: i40e_dev_stats_get(): tx_broadcast:        0
>> PMD: i40e_dev_stats_get(): tx_discards:         0
>> PMD: i40e_dev_stats_get(): tx_errors:           0
>> PMD: i40e_dev_stats_get(): tx_dropped_link_down:     0
>> PMD: i40e_dev_stats_get(): crc_errors:               0
>> PMD: i40e_dev_stats_get(): illegal_bytes:            0
>> PMD: i40e_dev_stats_get(): error_bytes:              0
>> PMD: i40e_dev_stats_get(): mac_local_faults:         1
>> PMD: i40e_dev_stats_get(): mac_remote_faults:        1
>> PMD: i40e_dev_stats_get(): rx_length_errors:         0
>> PMD: i40e_dev_stats_get(): link_xon_rx:              0
>> PMD: i40e_dev_stats_get(): link_xoff_rx:             0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[0]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[0]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[1]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[1]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[2]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[2]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[3]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[3]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[4]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[4]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[5]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[5]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[6]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[6]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_rx[7]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_rx[7]:     0
>> PMD: i40e_dev_stats_get(): link_xon_tx:              0
>> PMD: i40e_dev_stats_get(): link_xoff_tx:             0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[0]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[0]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[0]:  0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[1]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[1]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[1]:  0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[2]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[2]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[2]:  0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[3]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[3]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[3]:  0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[4]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[4]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[4]:  0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[5]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[5]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[5]:  0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[6]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[6]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[6]:  0
>> PMD: i40e_dev_stats_get(): priority_xon_tx[7]:      0
>> PMD: i40e_dev_stats_get(): priority_xoff_tx[7]:     0
>> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[7]:  0
>> PMD: i40e_dev_stats_get(): rx_size_64:               0
>> PMD: i40e_dev_stats_get(): rx_size_127:              0
>> PMD: i40e_dev_stats_get(): rx_size_255:              0
>> PMD: i40e_dev_stats_get(): rx_size_511:              0
>> PMD: i40e_dev_stats_get(): rx_size_1023:             0
>> PMD: i40e_dev_stats_get(): rx_size_1522:             167790000
>> PMD: i40e_dev_stats_get(): rx_size_big:              0
>> PMD: i40e_dev_stats_get(): rx_undersize:             0
>> PMD: i40e_dev_stats_get(): rx_fragments:             0
>> PMD: i40e_dev_stats_get(): rx_oversize:              0
>> PMD: i40e_dev_stats_get(): rx_jabber:                0
>> PMD: i40e_dev_stats_get(): tx_size_64:               0
>> PMD: i40e_dev_stats_get(): tx_size_127:              0
>> PMD: i40e_dev_stats_get(): tx_size_255:              0
>> PMD: i40e_dev_stats_get(): tx_size_511:              0
>> PMD: i40e_dev_stats_get(): tx_size_1023:             0
>> PMD: i40e_dev_stats_get(): tx_size_1522:             0
>> PMD: i40e_dev_stats_get(): tx_size_big:              0
>> PMD: i40e_dev_stats_get(): mac_short_packet_dropped: 0
>> PMD: i40e_dev_stats_get(): checksum_error:           0
>> PMD: i40e_dev_stats_get(): fdir_match:               0
>> PMD: i40e_dev_stats_get(): ***************** PF stats end
>> ********************
>> ...
>>
>> The count for rx_unicast is exactly the number of packets we would have
>> expected and the count for rx_discards in the VSI stats is exactly the number of
>> packets we are missing.
>> The question is why this number shows up only in the VSI stats and not in the PF
>> stats and of course why the packets which were obviously discarded are still
>> counted in the rx_unicast stats.
>> This test was performed using DPDK 2.1 and the firmware of the XL710 is the
>> latest one (FW 4.40 API 1.4 NVM 04.05.03).
>> Do you have an idea what might be going on?
>>
>> Best regards,
>> Martin
>>
>>



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