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selftests: tc-testing: cap parallel tdc to 4 cores

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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@mojatatu.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/20231117171208.2066136-2-pctammela@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pedro Tammela 2023-11-17 14:12:03 -03:00 • committed by Jakub Kicinski
parent b1711d4310
commit 025de7b6a6
1 changed files with 1 additions and 0 deletions
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1
tools/testing/selftests/tc-testing/tdc.py
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@ -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: