Ictcp incast congestion control for tcp in data center networks by hilfi alkaff
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ICTCP: Incast Congestion Control for TCP in Data Center Networks By: Hilfi Alkaff. Problem: Incast Congestion. - Occurs as the number of storage servers sending data to a client increases past the ability of an Ethernet switch to buffer packets. Solution: Modify RCWND Dynamically.

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ICTCP: Incast Congestion Control for TCP in Data Center Networks By: Hilfi Alkaff

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Ictcp incast congestion control for tcp in data center networks by hilfi alkaff

ICTCP: Incast Congestion Control for TCP in Data Center Networks

By: Hilfi Alkaff


Problem incast congestion

Problem: Incast Congestion

- Occurs as the number of storage servers sending data to a client increases past the ability of an Ethernet switch to buffer packets.


Solution modify rcwnd dynamically

Solution: Modify RCWND Dynamically

  • Should not be too small or too big.

  • Done on the receiver side.

  • No modification to TCP option + header.

  • Implemented as Windows NDIS.


Algorithm

Algorithm

  • Calculate available bandwidth → Increase when enough quota

  • Divide window to two slots. In 1st sub-slot, rcwnd cannot be increased but in 2nd sub-slot, it could be increased up to the available bandwidth observed in 1st slot


Algorithm contd

Algorithm (Contd)

Measured throughput: Current application requirement over the TCP connection → max (observed throughput, exponentially filtered throughput)

Expected throughput: Throughput that is achieved if only constrained by rcwnd → max (measured throughput, rwnd/RTT)


Implementation windows ndis

Implementation: Windows NDIS

TCP/IP Stack

Flow Table

Packet Header

Parser

Algorithm

NIC Driver


Other solutions

Other solutions?

  • Larger switch buffers

  • Effective Fine-grained TCP Retransmissions for Datacenter Communications (SIGCOMM 2009)

  • Efficient Packet Transport for the Commoditized Data Center (SIGCOMM 2010)

  • TCP Vegas


Discussion comments

Discussion/Comments

  • (Un)fairness

  • Moving to non-driver solution?

  • Hella grammatical errors

  • Different topology?


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