https://bugs.dpdk.org/show_bug.cgi?id=1200
Bug ID: 1200
Summary: mlx5_tx_handle_completion: bad timestamp
Product: DPDK
Version: 22.03
Hardware: x86
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: core
Assignee: dev@dpdk.org
Reporter: 7532ya...@gmail.com
Target Milestone: ---
In the file `dpdk/drivers/net/mlx5/mlx5_tx.c` method
`mlx5_tx_handle_completion` I inspect the timestamp field of a cqe:
@@ -192,6 +196,9 @@ mlx5_tx_handle_completion(struct mlx5_txq_data
*__rte_restrict txq,
cqe = &txq->cqes[txq->cq_ci & txq->cqe_m];
ret = check_cqe(cqe, txq->cqe_s, txq->cq_ci);
+ if (ret==MLX5_CQE_STATUS_HW_OWN) {
+ printf("line:%d cqe timestamp: %lu\n", __LINE__, cqe->timestamp);
+ }
Consider transmitting several thousand packets. This print to stdout with
regard to the timestamp,
* prints 0 for timestamp for the first ~2000 packet completions
* prints non-zero numbers thereafter, however, not monotonically increasing
e.g. completion event timestamp for occurrence N is 10x smaller than N-1
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