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Unlocking Superior Performance in Reconfigurable DCNs with Credit-Based Transport (Flare)#

SIGCOMM 2025 digest Program Core pick Coimbra · 8–11 September 2025

Paper Recording

Federico De Marchi et al. (MPI-INF, Meta, NVIDIA)

Play the recording: Unlocking Superior Performance in Reconfigurable DCNs with Credit-Based Transport (Flare)

Why: Reconfigurable (microsecond-switched) DCNs are a credible post-Moore alternative to Clos, but transport has been the gap; this closes part of it.

What: A credit-based transport that lets RDCNs beat Clos on throughput (up to 1.15x even under adversarial traffic) and substantially cut flow completion times vs NDP/ExpressPass/TDTCP/Bolt.

How: Reliable credit-based delivery that opportunistically routes over the RDCN's rapidly reconfiguring short-path circuits; testbed on programmable switches + DPDK.

Where applicable: Applies to reconfigurable-DCN designs specifically — relevant if/when RDCNs are on the table; mostly simulation plus a feasibility testbed.