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GRO tests are timing dependent and can easily flake. This is partially mitigated in gro.sh by giving each subtest 3 chances to pass. However, this still flakes on some machines. Reduce the flakiness by: - Bumping retries to 6. - Setting napi_defer_hard_irqs to 1 to reduce the chance that GRO is flushed prematurely. This also lets us reduce the gro_flush_timeout from 1ms to 100us. Tested: Ran `gro.sh -t large` 1000 times. There were no failures with this change. Ran inside strace to increase flakiness. Signed-off-by: Kevin Krakauer <krakauer@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250226192725.621969-4-krakauer@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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