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Examine the tx counters in WRRtest instead of counting what arrives #15353

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Examine the tx counters in WRRtest instead of counting what arrives #15353

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8 changes: 6 additions & 2 deletions tests/saitests/py3/sai_qos_tests.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3883,8 +3883,12 @@ def runTest(self):
queue_counters_base)), file=sys.stderr)

print([q_cnt_sum, total_pkts], file=sys.stderr)
# All packets sent should be received intact
assert (q_cnt_sum == total_pkts)

txPacketCount = port_counters[TRANSMITTED_OCTETS] - port_counters_base[TRANSMITTED_OCTETS]
# At least the correct number of packets must have been transmitted
assert (q_cnt_sum <= txPacketCount)
# And at least one of the valid packets has arrived at PTF
assert (total_pkts > 1)
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@XuChen-MSFT XuChen-MSFT Dec 5, 2024

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If q_cnt_sum > total_pkts is caused by PTF performance issues, especially when no any queue has fully received packets, it is impossible to perform the following check:

assert diff < limit, "Difference for %d is %d which exceeds limit %d" % (dscp, diff, limit)

In this case, we cannot determine whether the WRR test has passed. However, the following assertion allows the test to pass:

assert (total_pkts > 1)

Should we modify the test case to still fail, so we know we haven't got a test result? and then we can decide rerun or xfail it.

Regarding the PTF performance limit, can we determine the answer by comparing counters per queue (like: show que cou) instead of per port,
or implement similar test using Snappi?

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@byu343 byu343 Dec 18, 2024

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For that assert diff < limit check to test the round robin, it seems to me that it requires to know in which order packets are delivered. There is a large gap now between the number of packets delivered and total sent for the performance issue. so I agree that we could not really verify it.

As for your suggestion of comparing counters per queue, can you elaborate what and how to verify using it?

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@XuChen-MSFT XuChen-MSFT Jan 21, 2025

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@byu343
Recently, Cisco have a WA solution to set cir to slower speeds druing WRR testing. Can we adopt this idea?
PRs are as below:
#15718
#16315

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@davidm-arista davidm-arista May 7, 2025

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That solution will not scale to fast port types



class LossyQueueTest(sai_base_test.ThriftInterfaceDataPlane):
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