Today a fresh I-D was published, titled: “Host/Host Protocol for the ARPA Network” from Alexander McKenzie and Steve Crocker; covering Internet history. Great I-D: This document reproduces the Host/Host Protocol developed by the ARPA Network Working Group during 1969, 1970 and 1971. It describes a protocol used to manage communication between processes residing on independent Hosts. It addresses issues of multiplexing multiple streams of communication over a single hardware interface including addressing, flow control, connection establishment/disestablishment, and other signaling....

Today I spent quite some hours in spotting some packet drops at Gigabit line rate. Stress-testing the hardware at line-rate reveal a lot of noise and disagreements: it is difficult to determine _what_ really is the source of packet drops. Due to some netperf and perf analysis and some new tracepoints the eyes focus on PCI express bus. Quite a lot of analysis until that, first I interpreted the raw values as a CPU limitation....

Last time as I posted about TCP fairness aspects of TCP I don’t touched the topic in great detail. But TCP fairness and protocol fairness in general is a important requirement in the whole IP communication zoo. In this blog posting I will write some sentences about the fairness aspects of a network layer protocol and particular TCP. UDP and Datagram based Protocols To start with UDP - as a unreliable, unordered lightweight datagram based service - provides no fairness mechanisms at all....

Traveling back from Berlin to Munich. This time via City-Night-Train booked in a six-person wagon. Reading “der Freitag”, a Berlin weekly newspaper produced here in Berlin until midnight. One of Kitas professor suggest the paper. I took this extended weekend (from Thursday) to arrange our new home in Weissensee/Berlin. Paint the rooms white and the floor in a special mixed color. Next time I will establish the parquet (84m^2). After that all ground work is done and the furniture can be ebayed[TM]....

Between 15th and 25th of July I was at Majorca/Spain for one week of relaxing (including a little bit of climbing). A really nice spot!

Quit interesting Westmere-EP CPU: of cores | 6 | of threads | 12 | Bus speed | 2933 MHz QPI | System Bus|5.86 GT/s| Level 1 cache size | 6 x 32 KB icache, 6 x 32 KB dcache | Level 2 cache size | 6 x 256 KB | Level 3 cache size | 12 MB | Features | SSE4.2, Turbo Boost, AES New Instructions, Enhanced Intel SpeedStep Technology. … | Max Memory Bandwidth | 32 GB/s| Memory Types| DDR3-800/1066/1333| Lithography| 32 nm|...

“Libhashish”:http://libhashish.sourceforge.net/ is one of my long term project developed with git. Today I stumbled over a tool to visualize commits, called gource: Your browser does not support the video tag (or webm codec).

“Mobility Support in IPv6”:http://tools.ietf.org/html/rfc6275 - Request for Comments: 6275

Jesper Juhl today on LKML questioning about the new Kernel naming scheme: “… There are a few scripts that need fixing if SUBLEVEL goes the way of the Dodo, but I didn’t want to start fixing those without a clear indication of whether or not SUBLEVEL is going to/should die.”