NDT-DEV email list created

Revision: 608
Author:   

Date:     Thu Sep  8 07:37:00 2011
Log:      Fixes in the link type detection heuristics section.
http://code.google.com/p/ndt/source/detail?r=608

Modified:
 /wiki/NDTTestMethodology.wiki

=======================================
--- /wiki/NDTTestMethodology.wiki       Thu Sep  8 07:15:52 2011
+++ /wiki/NDTTestMethodology.wiki       Thu Sep  8 07:37:00 2011
@@ -209,11 +209,11 @@

 === Link Type Detection Heuristics ===

-The following link type detection heuristics are run only when there is no  
duplex mismatch condition detected and the  
[NDTTestMethodology#Total_send_throughput total send throughput] is the  
same or smaller than the [NDTTestMethodology#Theoretical_maximum_bandwidth  
theoretical maximum bandwidth] (which is a correct situation).
+The following link type detection heuristics are run only when there is no  
duplex mismatch condition detected and the  
[NDTTestMethodology#Total_send_throughput total send throughput] is the  
same or smaller than the [NDTTestMethodology#Theoretical_maximum_bandwidth  
theoretical maximum bandwidth] (which is an expected situation).

 ==== DSL/Cable modem ====

-The link is treated as a DSL/Cable modem when the sender isn't a  
bottleneck and the [NDTTestMethodology#Total_send_throughput total send  
throughput] is less than 2 Mbps and less than the  
[NDTTestMethodology#Theoretical_maximum_bandwidth theoretical maximum  
bandwidth].
+The link is treated as a DSL/Cable modem when the NDT Server isn't a  
bottleneck and the [NDTTestMethodology#Total_send_throughput total send  
throughput] is less than 2 Mbps and less than the  
[NDTTestMethodology#Theoretical_maximum_bandwidth theoretical maximum  
bandwidth].

 This means that all of the following conditions should be met:
  * The cumulative time spent in the 'Sender Limited' state *is less than  
0.6 ms*
@@ -221,9 +221,13 @@
  * The [NDTTestMethodology#Total_send_throughput total send throughput]  
*is less than 2 Mbps*
  * The [NDTTestMethodology#Total_send_throughput total send throughput]  
*is less than* [NDTTestMethodology#Theoretical_maximum_bandwidth  
theoretical maximum bandwidth]

+===== Known issues (DSL/Cable modem detection heuristic) =====
+
+The [NDTTestMethodology#DSL/Cable_modem DSL/Cable modem] heuristic appears  
to be broken now because the DSL/Cable modems commonly go above 2Mbps  
nowadays.
+
 ==== IEEE 802.11 (!WiFi) ====

-The link is treated as a wireless one when the  
[NDTTestMethodology#DSL/Cable_modem DSL/Cable modem] is not detected, the  
receiver is a bottleneck and the [NDTTestMethodology#Total_send_throughput  
total send throughput] is less than 5 Mbps but the  
[NDTTestMethodology#Theoretical_maximum_bandwidth theoretical maximum  
bandwidth] is greater than 50 Mibps.
+The link is treated as a wireless one when the  
[NDTTestMethodology#DSL/Cable_modem DSL/Cable modem] is not detected, the  
NDT Client is a bottleneck and the  
[NDTTestMethodology#Total_send_throughput total send throughput] is less  
than 5 Mbps but the [NDTTestMethodology#Theoretical_maximum_bandwidth  
theoretical maximum bandwidth] is greater than 50 Mibps.

 This means that all of the following conditions should be met:
  * The heuristic for DSL/Cable modem link *gives negative results*
@@ -245,10 +249,6 @@
  * The [NDTTestMethodology#Packet_loss packet loss] *is less than 1%*
  * The [NDTTestMethodology#Packets_arriving_out_of_order out of order  
packets proportion] *is less than 3.5%*

-==== Known issues (Link Type Detection Heuristics) ====
-
-The [NDTTestMethodology#DSL/Cable_modem DSL/Cable modem] heuristic appears  
to be broken now because the DSL/Cable modems commonly go above 2Mbps  
nowadays.
-
 === Faulty Hardware Link Detection ===

 A bad cable (faulty hardware link) is detected when all of the following  
conditions are met:
@@ -468,6 +468,6 @@
  * [NDTTestMethodology#Known_issues_(Middlebox_Test) Middlebox Test]
  * [NDTTestMethodology#Known_limitations_(Bottleneck_Link_Detection)  
Bottleneck Link Detection]
  *  
[NDTTestMethodology#Known_issues/limitations_(Duplex_Mismatch_Detection)  
Duples Mismatch Detection]
- * [NDTTestMethodology#Known_issues_(Link_Type_Detection_Heuristics) Link  
Type Detection Heuristics]
+ * [NDTTestMethodology#Known_issues_(DSL/Cable_modem_detection_heuristic)  
DSL/Cable modem detection heuristic]
  * [NDTTestMethodology#Known_issues_(Faulty_Hardware_Link_Detection)  
Faulty Hardware Link Detection]
  * [NDTTestMethodology#Known_issues_(Theoretical_maximum_bandwidth)  
Theoretical maximum bandwidth]