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SUMMARY:Towards synchronized (and programmable) datacenters - Vishal Shriv
 astav (Cornell University)
DTSTART:20160728T140000Z
DTEND:20160728T150000Z
UID:TALK66337@talks.cam.ac.uk
CONTACT:Liang Wang
DESCRIPTION:Synchronized time is critical to distributed systems and netwo
 rk applications in a datacenter network. Unfortunately\, many clock synchr
 onization protocols in datacenter networks such as NTP and PTP are fundame
 ntally limited by the characteristics of packet switching networks. In par
 ticular\, network jitter\, packet buffering and scheduling in switches\, a
 nd network stack overheads add non-deterministic variances to the round tr
 ip time\, which must be accurately measured to synchronize clocks precisel
 y.\nIn the first part of the talk\, I will present the Datacenter Time Pro
 tocol (DTP)\, a clock synchronization protocol that does not use packets a
 t all\, but is able to achieve nanosecond precision. In essence\, DTP uses
  the physical layer of network devices (servers and switches) to implement
  a decentralized clock synchronization protocol. By doing so\, DTP elimina
 tes most non-deterministic elements in clock synchronization protocols and
  achieves a bounded precision.\n\nIn the second part of the talk\, I will 
 discuss some of my ongoing work which leverages tight synchronization amon
 gst the nodes in a rack to build an efficient networking stack for rack-sc
 ale architectures. Finally I will briefly discuss some of my future work w
 here I plan to combine synchronization with programmability (via P4) to ad
 dress some of the core challenges in the current datacenter networks.\n\nB
 io: Vishal Shrivastav is a second year graduate student at Cornell Univers
 ity\, advised by Prof. Hakim Weatherspoon. His research interests span bui
 lding high performance networking systems for datacenter and rack-scale do
 mains. Before coming to Cornell\, Vishal did his undergraduate studies at 
 Indian Institute of Technology (IIT)\, Kharagpur. 
LOCATION:FW26\, Computer Laboratory\, William Gates Building
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