Intel E810 Performance Regression - ARM Grace Server

[Manit Mahajan]

Hi we have an update about the single core forwarding test on the ARM Grace
server with the E810 100G Ice card. There was an intel PMDs series that was
merged a week ago which had some performance failures when it was going
through the CI:
https://patches.dpdk.org/project/dpdk/patch/01c94afcb0b1c2795c031afc872a8faf3f0db2b5.1749229651.git.anatoly.burakov@intel.com/

and: http://mails.dpdk.org/archives/test-report/2025-June/883654.html

As you can see it causes roughly a 6% decrease in packets forwarded in the
single core forwarding test with 64Byte frames and 512 txd/rxd. The delta
tolerance on the single core forwarding test is 5%, so a 6% reduction in
MPPS forwarded is a failure.

This was merged into mainline 6 days ago, which is why some failures
started to come in this week for the E810 Grace test.

To double check this, on DPDK I checked out to:

test/event: fix event vector adapter timeouts
(2eca0f4cd5daf6cd54b8705f6f76f3003c923912) which directly precedes the
Intel PMD patchseries, and ran the test and it forwarded the pre-regression
MPPS that we expected.

Then I checked out to net/intel: add common Tx mbuf recycle
(f5fd081c86ae415515ab55cbacf10c9c50536ca1)

and I ran the test and it had the 6% reduction in MPPS forwarded.

Another thing to note is that regrettably the ARM Grace E810 test did not
get run on the v7 (the final version) of this series, which meant the
failure was not displayed on that version and that's probably why it was
merged. We will look back into our job history and see why this test failed
to report.

Please let me know if you have any questions about the test, the testbed
environment info, or anything else.

Thanks,
Manit Mahajan
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