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fix: deflake xnet_slo_120 test by allocating to Dells only and doubling vCPUs#10552

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fix: deflake xnet_slo_120 test by allocating to Dells only and doubling vCPUs#10552
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@basvandijk basvandijk commented Jun 23, 2026

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//rs/tests/message_routing/xnet:xnet_slo_120_subnets_staging_test_colocate is 50% flaky since the send rate on some subnets is often below the minimum of 0.3.

As an experiment to fix this we force allocation of IC nodes to the more performant Dell hosts to not mix in the slightly slower Supermicros. We also double the number of vCPUs for IC nodes from 6 to 12 to give the VMs a bit more capacity.

If this doesn't make the test more stable we could try labelling the test with cpu:64 so no other system_test_large tests will run at the same time ensuring the hosts are more idle to get more consistent performance characteristics.

Passing manual run: BuildBuddy.

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