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An exploration of Stochastic Fairness Queuing (SFQ), a 1990 algorithm by Paul McKenney that isolates workloads from different clients using a fixed set of hash-assigned queues with O(1) complexity. Unlike strict per-client queuing (O(customers) queues), SFQ uses a periodically perturbed hash function to prevent noisy neighbors from permanently degrading service for co-located clients. The post also discusses combining SFQ with shuffle sharding and best-of-two selection to further reduce transient bad service periods, achieving strong noisy-neighbor isolation with O(1) enqueue and dequeue effort.

SFQ: Simple, Stateless, Stochastic Fairness