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2cfc517874
Seastar's default limit of 10,000 iocbs per shard is too low for some workload (it places an upper bound on the number of idle connections, above which a crash occurs). Use the new Seastar feature to raise the default to 50000. Also multiply the global reservation by 5, and round it upwards so the number is less weird. This prevents io_setup() from failing. For tests, the reservation is reduced since they don't create large numbers of connections. This reduces surprise test failures when they are run on machines that haven't been adjusted. Fixes #9051 Closes #9052