https://bugs.dpdk.org/show_bug.cgi?id=521
Bug ID: 521
Summary: i40e: incorrect byte counters
Product: DPDK
Version: 18.11
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: iryz...@nfware.com
Target Milestone: ---
After running under 10G traffic over 3 days, the X710 card starts showing
incorrect RX/TX bytes statistics.
The problem seems to happen because of the following code in
i40e_update_vsi_stats:
/* exclude CRC bytes */
nes->rx_bytes -= (nes->rx_unicast + nes->rx_multicast +
nes->rx_broadcast) * ETHER_CRC_LEN;
The rx_bytes counter in X710 cards is 48-bit long, so it takes around 3 days to
overflow. When it overflows, it becomes less than (rx_pkts * ETHER_CRC_LEN),
and the substruction makes it a negative number, or, to be more precise, a very
big positive number, as it's uint64_t.
For XL710 40G cards, it will take less than one day to face the issue.
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