I am a third year graduate student at the computer science department
at Princeton university, co-advised by
Dr. Jennifer Rexford and
Dr. Mung Chiang (EE).
I am broadly interested in computer networks and building large-scale
networked systems.
I received a B.Tech in Computer Science and Engineering in May 2010
from the
Computer Science
department at Indian Institute of Technology Madras
(
IITM).
Contact Information
Snail mail: 35 Olden street, Princeton, NJ 08540.
Email: <lastname> AT cs.princeton.edu
Office: COS 316
Publications
Distributed Wide-Area Traffic Management for Cloud Services
Srinivas Narayana, Joe Wenjie Jiang, Jennifer Rexford, Mung Chiang
[Extended abstract] ACM Sigmetrics 2012
Systems and methods for transactions on the Telecom Web
Anupam Joshi, Srinivas Narayana and Aaditeshwar Seth
USPTO application #20110213706, patent pending
Experience
Princeton University
Joint data center and route selection for online services
The performance of user-facing services (e.g., Amazon, Facebook,
Google search) depends heavily on which data centers handle client
requests, and which wide-area paths carry the response traffic. We
observe that selecting data centers and network routes independently,
as is common for today's services, can lead to much worse performance
or higher costs than a coordinated decision. We have designed a system
that achieves a desired cost-performance tradeoff by jointly
optimizing the selection of data centers and routes, while retaining
the administrative separation between them. Our ongoing evaluation
shows that our system converges quickly in practice and offers lower
cost and much better performance than existing
solutions---illustrating benefits of compatible objectives between
request mapping and response routing systems, sharing information, and
employing optimization models that admit optimal distributed
computation.
An Openflow controller for interoperable 802.1D Ethernet spanning
tree
Openflow is rapidly being embraced by industry as a practical next
step to mitigate the "ossification" of computer network stacks. To
meet these goals, Openflow needs to be incrementally deployable
alongside legacy network equipment---which necessitates backwards
compatibility with these equipment and the protocols they
implement. Today, there is some support for emulation of protocol
functionality on a fully Openflow network, and backwards compatibility
in the form of Openflow-
capable hardware (run either in
traditional L2/L3 mode or Openflow mode exclusively). However, full
support for
simultaneous legacy-interoperability and
controller/flow-table customization is lacking. We make a modest step
in this direction by implementing the Ethernet Spanning Tree Protocol
(STP 802.1D) on an Openflow network. The controller runs the STP
algorithm separately for every switch, generating STP packets and
instructing switches to send and receive them. We have designed a
modular architecture for our protocol implementation which allows
the system to be easily extensible to other protocols.
Configurable line-rate traffic monitoring on a netFPGA
NetFPGA is a programmable PCI card with an on-board FPGA and GigaBit
Ethernet ports. We developed a tool that implements easily
configurable counter and field-based packet sampling on a NetFPGA,
based on the PSAMP RFC (5476). Configuration is supported through a
simple command line register interface.
Indian Institute of Technology Madras
Stability of explicit congestion control protocols
Rate Control Protocol (RCP) is a transport mechanism that uses
explicit rate feedback from points in the network at traffic sources
to achieve small flow completion times. Our investigations on RCP
stability stem from two observations---first, small-buffer variants of
RCP that control queues through the mean of their distributions
exhibit oscillatory behaviour inside their `stable' regions, when flow
bandwidth-delay products are reduced. Second, we found parameter
regions under this regime in which queue and rate instabilities occur
in the presence of queue feedback, not otherwise. To explain these
non-intutive observations, we modelled the small-buffer RCP feedback
loop with explicit queue evolutions, and analytically found necessary
and sufficient stability conditions---whose predictions agree with our
initial observations. We also characterized the observed instabilities
just outside the stable region through Hopf bifurcations.
IBM Research India, Bangalore (internship May-Jul 2009)
Transactions on the World Wide Telecom Web (WWTW)
WWTW (also known as the "spoken web") is a voice-driven equivalent of
the WWW over the Telecom network, started as a pilot project by IBM
Research India to enable developing regions leverage the benefits of
the WWW through their mobile phones (which are only required to have a
simple numeric keypad and voice connections). As part of my summer
internship, we developed a mechanism for securing financial
transactions over this medium using social trust to provide additional
authentication factors. Our work was peer reviewed internally at IBM
Research India and a patent application has been filed.
Courses
Advanced computer systems (Fall 2011)
Advanced algorithm design (Spring 2011)
Optimization of communication systems (Spring 2011)
Advanced
computer networks (Fall 2010)
Data
center networks and systems (Fall 2010)
Teaching
Advanced programming techniques (Spring 2012)
Operating systems (Fall 2011)
Last updated Sat Apr 28 2012 at 2300 EST
