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DTSTART;TZID=America/Chicago:20251116T150500
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UID:submissions.supercomputing.org_SC25_sess221_ws_indis107@linklings.com
SUMMARY:Network Replay and Consistency Across Testbeds
DESCRIPTION:Alexander Wolosewicz (Illinois Institute of Technology), Vinod
  Yegneswaran and Ashish Gehani (SRI), and Nik Sultana (Illinois Institute 
 of Technology)\n\nShared network testbeds are critical for systems and net
 working research. However, their shared hardware can introduce variability
 —like increased jitter or loss—that may impact experiment fidelity or repr
 oducibility.\n\nWe present Choir, the first 100 Gbps replay tool designed 
 to run on commodity hardware and shared infrastructures. Choir enables pre
 cise replay and measurement to observe how closely a testbed reproduces ex
 pected behavior. We also introduce a metric for quantifying consistency, d
 esigned to support comparison across time, configurations, and environment
 s.\n\nWe evaluate our approach on FABRIC and a local, bare-metal testbed. 
 We show that FABRIC, even with dedicated resources and low background util
 ization, has greater variability in inter-packet arrival times and latency
  compared to the local testbed. With high utilization on shared hardware, 
 this variability increases by an order of magnitude. Our findings demonstr
 ate how tools like Choir can help researchers better understand and mitiga
 te the effects of shared infrastructure.\n\nRecording: Livestreamed, Recor
 ded\n\nRegistration Category: Technical Program Reg Pass, Workshop Reg Pas
 s\n\nSession Chairs: Ezra Kissel (Energy Sciences Network (ESnet)); Rafael
  Silva-Guimaraes (Federal Institute of Espírito Santo, Department of Infor
 matics); Nik Sultana (Illinois Institute of Technology, SCinet); Cees de L
 aat (University of Amsterdam, Lawrence Berkeley National Laboratory (LBNL)
 ); Sonja Filiposka (Ss. Cyril and Methodius Univeristy in Skopje (UKIM) No
 rth Macedonia); and Akbar Kara (Ciena Corporation, SCinet)\n\n
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