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RX buffer size not changing

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Hi,
I am using a Intel 82599EB Network card and when I try to change the RX buffer setting using ethtool, it doesn't complain but doesn't change the value betyind 456. Can someone help me changing it

 

~ # ethtool -g vmnic7

Ring parameters for vmnic7:

Pre-set maximums:

RX:             4096

RX Mini:        0

RX Jumbo:       0

TX:             4096

Current hardware settings:

RX:             456

RX Mini:        0

RX Jumbo:       0

TX:             4096

 

 

~ # ethtool -G vmnic7 rx 4096

~ # ethtool -g vmnic7

Ring parameters for vmnic7:

Pre-set maximums:

RX:             4096

RX Mini:        0

RX Jumbo:       0

TX:             4096

Current hardware settings:

RX:             456

RX Mini:        0

RX Jumbo:       0

TX:             4096

 

 

~ #

 

 

 

I am seeing DMA error at not even half of line rate

 

 

~ # ethtool -i vmnic7

driver: ixgbe

version: 3.14.3iov

firmware-version: 0x8000030d, 14.0.12

bus-info: 0000:43:00.1

~ # ethtool -S vmnic7

NIC statistics:

     rx_packets: 17283008396

     tx_packets: 12937303984

     rx_bytes: 21366098665481

     tx_bytes: 19586964453846

     rx_errors: 0

     tx_errors: 0

     rx_dropped: 0

     tx_dropped: 0

     multicast: 2016177

     collisions: 0

     rx_over_errors: 0

     rx_crc_errors: 0

     rx_frame_errors: 0

     rx_fifo_errors: 0

     rx_missed_errors: 531729

     tx_aborted_errors: 0

     tx_carrier_errors: 0

     tx_fifo_errors: 0

     tx_heartbeat_errors: 0

     rx_pkts_nic: 27985414043

     tx_pkts_nic: 12935893014

     rx_bytes_nic: 35072083114461

     tx_bytes_nic: 19688315359372

     lsc_int: 27

     tx_busy: 0

     non_eop_descs: 0

     broadcast: 2353243

     rx_no_buffer_count: 0

     tx_timeout_count: 0

     tx_restart_queue: 0

     rx_long_length_errors: 0

     rx_short_length_errors: 0

     tx_flow_control_xon: 17

     rx_flow_control_xon: 0

     tx_flow_control_xoff: 18

     rx_flow_control_xoff: 0

     rx_csum_offload_errors: 8

     rx_header_split: 0

     alloc_rx_page_failed: 0

     alloc_rx_buff_failed: 0

     rx_no_dma_resources: 10705650092

     hw_rsc_aggregated: 0

     hw_rsc_flushed: 0

     fdir_match: 0

     fdir_miss: 0

     fdir_overflow: 0

     fcoe_bad_fccrc: 0

     fcoe_last_errors: 0

     rx_fcoe_dropped: 0

     rx_fcoe_packets: 0

     rx_fcoe_dwords: 0

     fcoe_noddp: 0

     fcoe_noddp_ext_buff: 0

     tx_fcoe_packets: 0

     tx_fcoe_dwords: 0

     os2bmc_rx_by_bmc: 0

     os2bmc_tx_by_bmc: 0

     os2bmc_tx_by_host: 0

     os2bmc_rx_by_host: 0

     tx_queue_0_packets: 170

     tx_queue_0_bytes: 169154

     tx_queue_1_packets: 47

     tx_queue_1_bytes: 9100

     tx_queue_2_packets: 3316566103

     tx_queue_2_bytes: 5021255735862

     tx_queue_3_packets: 2992751129

     tx_queue_3_bytes: 4530995244180

     tx_queue_4_packets: 38

     tx_queue_4_bytes: 8142

     tx_queue_5_packets: 35

     tx_queue_5_bytes: 7114

     tx_queue_6_packets: 3492432924

     tx_queue_6_bytes: 5287515341822

     tx_queue_7_packets: 3135553538

     tx_queue_7_bytes: 4747197938472

     tx_queue_8_packets: 0

     tx_queue_8_bytes: 0

     rx_queue_0_packets: 7348183590

     rx_queue_0_bytes: 6324866393749

     rx_queue_1_packets: 3810634678

     rx_queue_1_bytes: 5769271266826

     rx_queue_2_packets: 2989697478

     rx_queue_2_bytes: 4526370722346

     rx_queue_3_packets: 3134492658

     rx_queue_3_bytes: 4745590283216

     rx_queue_4_packets: 0

     rx_queue_4_bytes: 0

     rx_queue_5_packets: 0

     rx_queue_5_bytes: 0

     rx_queue_6_packets: 0

     rx_queue_6_bytes: 0

     rx_queue_7_packets: 0

     rx_queue_7_bytes: 0

     rx_queue_8_packets: 0

     rx_queue_8_bytes: 0

     tx_pb_0_pxon: 0

     tx_pb_0_pxoff: 0

     tx_pb_1_pxon: 0

     tx_pb_1_pxoff: 0

     tx_pb_2_pxon: 0

     tx_pb_2_pxoff: 0

     tx_pb_3_pxon: 0

     tx_pb_3_pxoff: 0

     tx_pb_4_pxon: 0

     tx_pb_4_pxoff: 0

     tx_pb_5_pxon: 0

     tx_pb_5_pxoff: 0

     tx_pb_6_pxon: 0

     tx_pb_6_pxoff: 0

     tx_pb_7_pxon: 0

     tx_pb_7_pxoff: 0

     rx_pb_0_pxon: 0

     rx_pb_0_pxoff: 0

     rx_pb_1_pxon: 0

     rx_pb_1_pxoff: 0

     rx_pb_2_pxon: 0

     rx_pb_2_pxoff: 0

     rx_pb_3_pxon: 0

     rx_pb_3_pxoff: 0

     rx_pb_4_pxon: 0

     rx_pb_4_pxoff: 0

     rx_pb_5_pxon: 0

     rx_pb_5_pxoff: 0

     rx_pb_6_pxon: 0

     rx_pb_6_pxoff: 0

     rx_pb_7_pxon: 0

     rx_pb_7_pxoff: 0

~ #


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