Hi Alex,
Quick question on when RXMPC is incremented on 82599 hardware.
Does the hardware check if RDH[n] == RDT[n]. If this is true there are no
descriptors free, hence packet dropped, RXMPC[n]++?
8.2.3.23.4 Rx Missed Packets Count — RXMPC[n] (0x03FA0 + 4*n, n=0...7; RC)
DBU-Rx
Register ‘n’ counts the number of missed packets per packet buffer ‘n’.
Packets are missed when the receive FIFO has insufficient space to store the
incoming
packet. This may be caused due to insufficient buffers allocated, or because
there is
insufficient bandwidth on the IO bus. Events setting this counter also set
the receiver
overrun interrupt (RXO). These registers do not increment if receive is not
enabled and
count only packets that would have been posted to the SW driver.
Regards
Jonathan
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