This data is Copyright (c) Simon Crosby, 1994, University of Cambridge, UK. You may freely distribute this data but must retain the copyright notice.
ftp host is: ftp.cl.cam.ac.uk login: anonymous directory: reports/ATM/docs-94-3/* OR URL: http://www.cl.cam.ac.uk/Research/SRG/bluebook.htmlThis is also available as the Systems Research Group Technical Note of March 1994 (the blue book), and can be obtained from the technical reports service at Cambridge: send email to email@example.com
ftp host is: ftp.cl.cam.ac.uk login: anonymous directory: fairdata/ftp-trace/ files: as described above - trace data readme - this note OR URL: ftp://ftp.cl.cam.ac.uk/fairdata/ftp-trace/
The topology for the first experiments was as follows:
Unix ftp server + ATM <--> switch 1 <--> switch 2 <--> Unix ftp client + ATMThe ftp client requests data (the data varies, see below) from the ftp server over the Fairisle network. Both client and server interface directly to the ATM network. Both of these machines are DECStation 25000 mips machines running Ultrix 4.3. The ATM protocol stack and connection management are described in the blue book. The ATM switches are Fairisle fpc3-based 8x8 switches. Each host was equipped with an ORL Yes V2.2 ATM interface (described in the blue book). This interface has limited buffer space and operates in polled I/O mode; consequently its performance is severely limited.
Within an experiment <name> the files are:
Measurements made at switch 1 without any interfering traffic, on the input side to the fabric before any multiplexing with other traffic takes place.
Measurements made at switch 2 recording the acknowledgment/request traffic sent by the ftp client to the ftp server, at the input side of the fabric, before this traffic is multiplexed with any other data.
Measurements made at switch 2 on the input to the fabric, showing the multiplex of the data sent by the ftp server to the ftp client, and any other data which is routed from switch 1 to switch 2. This does not include the acknowledgment/request traffic.
A tick is a fabric cell time. The fabric cell time in these experiments was set to 3.56 microseconds. The transmission line rate was set to 4.4 microseconds per cell. A pair of back to back cells is recorded as an inter-arrival time of 1 tick.