Napi budget #125
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Napi budget #125
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time_squeeze for a softnet poll means we ran out of time specified in netdev_budget_usecs; if we see increases in time_squeeze, increase netdev_budget Signed-off-by: Alan Maguire <[email protected]>
Signed-off-by: Alan Maguire <[email protected]>
both netdev_budget and netdev_budget_usecs limit NAPI poll cycles, and if either is exhausted the time_squeeze value is updated. So to increase NAPI cycle time, both must be updated together. Signed-off-by: Alan Maguire <[email protected]>
correlate netdev budget increases with scheduler wait/run ratio; if tasks have to wait longer it is a signal the system is under load or that netdev budget is too big monopolizing CPUs. Tune down under these circumstances. Signed-off-by: Alan Maguire <[email protected]>
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auto-adjust net.core.netdev_budget[_usecs] to increase if we see time_squeezed regularly (signifying more packets were available to process in NAPI poll cycle). reduce these tunables if the time spent for tasks waiting relative to running increases with budget increases; this signals increased load, possibly created by us.