e1000: rx_no_buffer_count

[Khoa Nguyen]

I am running load test across a system with a Intel Gige interface. I
notice there are lots of rx_no_buffer_count errors:

     rx_length_errors: 0
     rx_over_errors: 0
     rx_crc_errors: 0
     rx_frame_errors: 0
     rx_no_buffer_count: 14200594
     rx_missed_errors: 29
     tx_aborted_errors: 0
     tx_carrier_errors: 0
     tx_fifo_errors: 0
     tx_heartbeat_errors: 0
     tx_window_errors: 0

but the CPUs utilization is only about 2%. What are the conditions
that may cause this rx_no_buffer_count condition?

Thanks,
Khoa
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