netdev - [PATCH net-next 1/6] selftests: tc-testing: cap parallel tdc to 4 cores

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Date: Fri, 17 Nov 2023 14:12:03 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: netdev@...r.kernel.org
Cc: jhs@...atatu.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	shuah@...nel.org,
	pctammela@...atatu.com,
	victor@...atatu.com
Subject: [PATCH net-next 1/6] selftests: tc-testing: cap parallel tdc to 4 cores

We have observed a lot of lock contention and test instability when running with >8 cores.
Enough to actually make the tests run slower than with fewer cores.

Cap the maximum cores of parallel tdc to 4 which showed in testing to
be a reasonable number for efficiency and stability in different kernel
config scenarios.

Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
---
 tools/testing/selftests/tc-testing/tdc.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/tc-testing/tdc.py b/tools/testing/selftests/tc-testing/tdc.py
index a6718192aff3..f764b43f112b 100755
--- a/tools/testing/selftests/tc-testing/tdc.py
+++ b/tools/testing/selftests/tc-testing/tdc.py
@@ -1017,6 +1017,7 @@ def main():
     parser = pm.call_add_args(parser)
     (args, remaining) = parser.parse_known_args()
     args.NAMES = NAMES
+    args.mp = min(args.mp, 4)
     pm.set_args(args)
     check_default_settings(args, remaining, pm)
     if args.verbose > 2:
-- 
2.40.1