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SUMMARY:Picosecond scale measurement for nanosecond scale networks  - Matt
 hew Grosvenor (Exablaze)
DTSTART:20170629T140000Z
DTEND:20170629T150000Z
UID:TALK72875@talks.cam.ac.uk
CONTACT:Liang Wang
DESCRIPTION:It’s no secret that network latencies are reducing. Commerci
 ally available Ethernet switches now advertise less than 50 nanosecond agg
 regation latencies and less than 5 nanosecond multicast latencies. The obv
 ious question for researchers and network operators is: how can we accurat
 ely measure\, verify and debug networks at these low latencies? In this ta
 lk I measure and compare the performance of various network capture soluti
 ons and their applicability to low latency networks. I find that despite p
 romising resolutions\, the accuracy of the devices vary considerably and c
 an introduce measurement errors of up to 90%. As a solution\, I introduce 
 and characterise the Exablaze High Precision Timestamping (HPT) capture de
 vice. The HPT is network capture device with 250 picosecond resolution and
  200 picosecond accuracy. Using the HPT as an example\, I discuss the worl
 d of picosecond scale measurement with an emphasis on techniques for accur
 ate\, verifiable network measurement at these levels. \n\nBio:\nMatthew Gr
 osvenor is a recent PhD graduate of Andrew Moore. He now works for Exablaz
 e\, a Sydney (Australia) based networking vendor that specialises in FPGA 
 based network products for the financial and high performance computing se
 ctors. Andrew and Matthew continue to collaborate on network measurement a
 nd low latency and FPGA based network research.
LOCATION:FW26\, Computer Laboratory\, William Gates Building
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