NDT-DEV email list created

Revision: 587
Author:   

Date:     Thu Sep  1 10:09:04 2011
Log:      Added links to the limited state time shares.
http://code.google.com/p/ndt/source/detail?r=587

Modified:
 /wiki/NDTTestMethodology.wiki

=======================================
--- /wiki/NDTTestMethodology.wiki       Thu Sep  1 09:57:12 2011
+++ /wiki/NDTTestMethodology.wiki       Thu Sep  1 10:09:04 2011
@@ -160,7 +160,7 @@
 The NDT contains two heuristics for the duplex mismatch detection.

 A duplex mismatch is detected by the Old Duplex-Mismatch algorithm when  
all of the following conditions are met:
- * The cumulative time spent in the 'Congestion Limited' state *is greater  
than 90% of the total test time*
+ * The  
[NDTTestMethodology#'Congestion_Limited'_state_time_share 'Congestion  
Limited' state time share] *is greater than 90%*
  * The [NDTTestMethodology#Speed_estimate speed estimate] *is greater than  
2000000 bits per second*
  * The number of segments transmitted containing at least some  
retransmitted data *is greater than 2 per second*
  * The maximum slow start threshold, excluding the initial value, *is  
greater than 0*
@@ -175,7 +175,7 @@
 The new duplex mismatch detection algorithm also discovers the problem  
when all of the following conditions are met:
  * The throughput speed measured during the S2C test *is greater than  
50000000 bits per second*
  * The [NDTTestMethodology#Web100_measured_speed web100 measured speed]  
*is less than 5000000 bits per second*
- * The cumulative time spent in the 'Receiver Limited' state *is greater  
than 90% of the total test time*
+ * The [NDTTestMethodology#'Receiver_Limited'_state_time_share 'Receiver  
Limited' state time share] *is greater than 90%*
  * The proportion of the number of multiplicative downward congestion  
window adjustments to the total number of segments sent *is less than 1%*

 === Link Type Detection Heuristics ===
@@ -198,7 +198,7 @@
  * The [NDTTestMethodology#Web100_measured_speed web100 measured speed]  
*is less than 5000000 bits per second*
  * The [NDTTestMethodology#Speed_estimate speed estimate] *is greater than  
52428800 bits per second*
  * The number of transitions into the 'Receiver Limited' state *is the  
same* as the number of transitions into the 'Congestion Limited' state
- * The cumulative time spent in the 'Receiver Limited' state *is greater  
than 90% of the total test time*
+ * The [NDTTestMethodology#'Receiver_Limited'_state_time_share 'Receiver  
Limited' state time share] *is greater than 90%*

 ==== Ethernet link (Fast Ethernet) ====

@@ -214,21 +214,21 @@

 A bad cable (faulty hardware link) is detected when all of the following  
conditions are met:
  * The [NDTTestMethodology#Packet_loss packet loss] multiplied by 100 and  
divided by the [NDTTestMethodology#Total_test_time_in_seconds total test  
time in seconds] *is greater than 15*
- * The proportion of the cumulative time spent in the 'Congestion Limited'  
state to the total test time divided by the total test time in seconds *is  
greater than 0.6* (*WARNING: this condition cannot be met*)
+ * The  
[NDTTestMethodology#'Congestion_Limited'_state_time_share 'Congestion  
Limited' state time share] divided by the  
[NDTTestMethodology#Total_test_time_in_seconds Total test time in seconds]  
*is greater than 0.6* (*WARNING: this condition cannot be met*)
  * The proportion of the number of multiplicative downward congestion  
window adjustments to the total number of segments sent *is less than 1%*
  * The maximum slow start threshold, excluding the initial value, *is  
greater than 0*

 === Full/Half Link Duplex Setting ===

 A half duplex is detected when all of the following conditions are met:
- * The cumulative time spent in the 'Receiver Limited' state *is greater  
than 95% of the total test time*
+ * The [NDTTestMethodology#'Receiver_Limited'_state_time_share 'Receiver  
Limited' state time share] *is greater than 95%*
  * The number of transitions into the 'Receiver Limited' state *is greater  
than 30 per second*
  * The number of transitions into the 'Sender Limited' state *is greater  
than 30 per second*

 === Normal Congestion Detection ===

 A normal congestion is detected when all of the following conditions are  
met:
- * The cumulative time spent in the 'Congestion Limited' state *is greater  
than 2% of the total test time*
+ * The  
[NDTTestMethodology#'Congestion_Limited'_state_time_share 'Congestion  
Limited' state time share] *is greater than 2%*
  * The duplex mismatch condition heuristic *gives negative results*
  * The maximum window advertisement received *is greater than* the maximum  
congestion window used during Slow Start