∫ntegrabℓε ∂iﬀerentiαℓs · unorganised notes, code, and writings of random topics

MagSafe repair

August 13, 2011 blog system

This is the fourth MagSafe adapter for my 2008 MacBook Pro. Basically I keep failing the adapter once a year. The original one has the cable broken near the brick (yes, the loose strand problem), I fixed it in an ugly way; then I ordered a second one in a... [more]

Kulkarni & Agrawal (2011) A Probabilistic Approach to Address TCP Incast in Data Center Networks (ICDCS)

August 9, 2011 paper

Existing solution to incast: [more]

Hayashi et al (2011) Improving Fairness of Quantized Congestion Notification for Data Center Ethernet Networks (ICDCS)

August 9, 2011 paper

There are fairness issue in QCN, which leads to unequal bandwidth allocation. The fairness problem is caused by probabilistic feedback to reduce control overhead. Excessively large or small amount of feedback to RP may cause imbalanced bandwidth consumption. Moreover, increase/decrease of rate depends on current rate. This is also a... [more]

Wadekar (2007) Enhanced Ethernet for Data Center: Reliable, Channelized and Robust (LANMAN)

August 9, 2011 paper

A summary of IEEE efforts to data center ethernet. [more]

Kuzmanovic et al (2009) Adding Explicit Congestion Notification (ECN) Capability to TCP's SYN/ACK packets (RFC5562)

August 8, 2011 paper

This experimental RFC suggest to extend ECN to SYN-ACK packets of TCP three-way handshake as well. The idea is to use initial window of 1 instead of 2, 3, or 4 for congested network. Note, ECN-capable transport (ECT) is not set on SYN packet, but on SYN-ACK packet. This is... [more]