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Today, network devices share buffer across priority queues to avoid dropsduring transient congestion. While cost-effective most of the time, thissharing can cause undesired interference among seemingly independent traffic.As a result, low-priority traffic can cause increased packet loss tohigh-priority traffic. Similarly, long flows can prevent the buffer fromabsorbing incoming bursts even if they do not share the same queue. The causeof this perhaps unintuitive outcome is that today's buffer sharing techniquesare unable to guarantee isolation across (priority) queues without staticallyallocating buffer space. To address this issue, we designed FB, a novel buffersharing scheme that offers strict isolation guarantees to high-priority trafficwithout sacrificing link utilizations. Thus, FB outperforms conventional buffersharing algorithms in absorbing bursts while achieving on-par throughput. Weshow that FB is practical and runs at line-rate on existing hardware (BarefootTofino). Significantly, FB's operations can be approximated in non-programmabledevices.

FB: A Flexible Buffer Management Scheme for Data Center Switches