On the site of Pittsburgh Supercomputing Center ( http://www.psc.edu/index.php/hpn-ssh ) shows detailed procedures for system tuning under various operating systems to provide a high bandwidth network.
I have four questions.
1) Possible or not consider this document as standard de- jure? Ie refer to it as an authoritative source of information in my research?
2) Evaluation service quality indicators for Internet access. Also a question.
For example, one of the Russian standards (53632-2009) defines the range of quality so -
- Login time
- The achieved data rate
- Coefficient of successful logins
For operating systems MS Windows Xp and MS Windows Vista (the standard says that the server and client operating systems must be are the same.).
In this case, on client host set (according 53632-2009)
- MSS between 1380 bytes and 1460 bytes - TCP Rx Window Size = 16384 bytes - SACK enabled (Selective Acknowledgment); - ECN disabled (Explicit Congestion Notification) - TCP Window Scaling disabled - TCP Timestamping disabled; - PMTU Discovery disabled (but DF-bit set) - TCP Fast Retransmit; - TCP Fast Recovery enabled; - Delayed ACK enabled (200 ms)
On the server (according 53632-2009) -
- MSS between 1380 bytes and 1460 bytes - TCP Rx Window Size> 4096 bytes - SACK enabled; - TCP Fast Retransmit; - TCP Fast Recovery enabled; - Delayed ACK enabled (200 ms)
Then from the server a number of times from different access points download file and determine quality scores described above.
(The file is a sequence of π and exceeds two times (at least) the theoretical maximum data rate).
3) What are there exist International Standards for evaluation of quality of Internet access services?
4) Use or not use the simulation in NS-2 (Network Simulator http://www.isi.edu/nsnam/ns/ ) to verify the results obtained in practice?
I would be very grateful for the information!