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app/testpmd: fix packet throughput after stats reset

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Testpmd calculates packet throughput by getting a diff of previous stats
value and current one.

If a stats clear called after previous sample taken, the diff will be
negative and throughput calculation will be wrong.

If current stats value is smaller than previous one, set throughput to
zero.

Fixes: 0e10698030 ("app/testpmd: show throughput in port stats")
Cc: stable@dpdk.org

Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
This commit is contained in:
Wei Zhao 2017-09-21 14:32:23 +08:00 committed by Ferruh Yigit
parent 8210e9e0d8
commit 69986a823d
1 changed files with 4 additions and 2 deletions
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6
app/test-pmd/config.c
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@ -203,8 +203,10 @@ nic_stats_display(portid_t port_id)
if (diff_cycles > 0)
diff_cycles = prev_cycles[port_id] - diff_cycles;
diff_pkts_rx = stats.ipackets - prev_pkts_rx[port_id];
diff_pkts_tx = stats.opackets - prev_pkts_tx[port_id];
diff_pkts_rx = (stats.ipackets > prev_pkts_rx[port_id]) ?
(stats.ipackets - prev_pkts_rx[port_id]) : 0;
diff_pkts_tx = (stats.opackets > prev_pkts_tx[port_id]) ?
(stats.opackets - prev_pkts_tx[port_id]) : 0;
prev_pkts_rx[port_id] = stats.ipackets;
prev_pkts_tx[port_id] = stats.opackets;
mpps_rx = diff_cycles > 0 ?