Hello vpp-dev,
I am looking for consultation. We started to test VPP for report on all LF CSIT
testbeds Skylakes and Haswells.
We are observing weird behavior. In each test we are using sequence to first
bring the both interfaces (physical up) by VAT:
sw_interface_set_flags sw_if_index <idx> admin-up (I also tried
sw_interface_set_flags sw_if_index idx admin-up link-up)
After setting all interfaces UP we are testing if interfaces are really UP by
VAT (loop 30times, 1s between API call check): "sw_interface_dump".
It wasn't an issue in past but recently we start seeing that sw_interface_dump
is reporting interfaces as link_down (admin-up).
Notes/symptoms:
- Our sw_interface_dump check is running 30x (1s interval) in loop.
- Link-down is random, sometimes both interfaces are link-up sometimes just
one and sometimes both link are down.
- It is not TB related, nor cabling related, we see it on Haswells-3node in
like 1 out of 70 tests, Skylakes-2node 1 out of 70, but on Skylake-3node more
than half of the tests.
- Checking state during test reveals that interfaces are link-down (show int)
so "sw_interface_dump" is reporting state correctly.
- Doing CLI during test "set interface state ... up" does bring interfaces UP
-> (but it is hard to check the timing here).
- Affected are mostly x520 and x710, but that is most probably because of
statistics (low coverage of other NICs like xxv710 and xl710).
- We have seen this in master vpp as well as rc2 vpp.
- It is not clear when this starts to happen, so bisecting would take lot of
time.
- This was spotted on VIRL as well also on Memif interface which bring us to
suspicious that this is related to API not HW.
Do you have an idea what we could check further? VPP is not crashing so no core
dump are available. This issue is not 100% replicable which makes it hard to
debug.
Is there a way to get more verbose error from the api call mentioned to reveal
more information?
Thank you.
Peter Mikus
Engineer - Software
Cisco Systems Limited
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