NDT-DEV email list created

Revision: 614
Author:   

Date:     Thu Sep  8 08:37:12 2011
Log:      Fixes in the computed variables section.
http://code.google.com/p/ndt/source/detail?r=614

Modified:
 /wiki/NDTTestMethodology.wiki

=======================================
--- /wiki/NDTTestMethodology.wiki       Thu Sep  8 08:16:56 2011
+++ /wiki/NDTTestMethodology.wiki       Thu Sep  8 08:37:12 2011
@@ -309,6 +309,8 @@

 === Total test time ===

+The total test time is the total time used by the S2C throughput test.
+
 The total test time is computed using the following formula:

 {{{
@@ -324,6 +326,8 @@

 === Total send throughput ===

+The total send throughput is the total amount of data (including  
retransmits) sent by the NDT Server to the NDT Client in the S2C throughput  
test.
+
 The total send throughput is computed using the following formula:

 {{{
@@ -338,6 +342,8 @@

 === Packet loss ===

+The packet loss is the percentage of the lost packets during the S2C  
throughput test.
+
 The packet loss proportion is computed using the following formula:

 {{{
@@ -345,7 +351,7 @@
 }}}

 where:
- * *!CongestionSignals* - The number of multiplicative downward congestion  
window adjustments due to all forms of congestion signals
+ * *!CongestionSignals* - The number of multiplicative downward congestion  
window adjustments due to all forms of congestion signals (this roughly  
correspond to a single lost packet)
  * *!PktsOut* - The total number of segments sent

 To avoid possible division by zero, the NDT sets the packet loss  
percentages to the following values when the `CongestionSignals` is 0:
@@ -354,6 +360,8 @@

 === Packets arriving out of order ===

+The packets arriving out of order is the percentage of the duplicated  
packets during the S2C throughput test.
+
 The out of order packets proportion is computed using the following  
formula:

 {{{
@@ -361,7 +369,7 @@
 }}}

 where:
- * *!DupAcksIn* - The number of duplicate ACKs received
+ * *!DupAcksIn* - The number of duplicate ACKs received (this roughly  
correspond to a single out-of-order packet when the TCP is forcing retries  
of such packets)
  * *!AckPktsIn* - The number of non-duplicate ACKs received

 === Average round trip time (Latency/Jitter) ===
@@ -378,17 +386,6 @@

 The average round trip time is kept in milliseconds.

-=== Average RTT in seconds ===
-
-The average round trip time in seconds is computed using the following  
formula:
-
-{{{
-AvgRTT/1000
-}}}
-
-where:
- * *AvgRTT* - [NDTTestMethodology#Average_round_trip_time_(Latency/Jitter)  
Average round trip time (Latency/Jitter)]
-
 === Theoretical maximum bandwidth ===

 The theoretical maximum bandwidth is computed using the following formula:
@@ -399,7 +396,7 @@

 where:
  * *CurrentMSS* - The current maximum segment size (MSS), in octets
- * *AvgRTTSec* - [NDTTestMethodology#Average_RTT_in_seconds Average RTT in  
seconds]
+ * *AvgRTTSec* -  
[NDTTestMethodology#Average_round_trip_time_(Latency/Jitter) Average round  
trip time (Latency/Jitter)] in seconds
  * *!PktsLoss* - [NDTTestMethodology#Packet_loss Packet loss]

 The theoretical maximum bandwidth is kept in Mibps.
@@ -418,6 +415,8 @@

 === 'Congestion Limited' state time share ===

+The 'Congestion Limited' state time share is the percentage of the time  
that the NDT Server was limited in sending due to the congestion window.
+
 The 'Congestion Limited' state time share is computed using the following  
formula:

 {{{
@@ -425,11 +424,13 @@
 }}}

 where:
- * *!TotalTestTime* - [NDTTestMethodology#Total_test_time Total test time]
  * *!SndLimTimeCwnd* - The cumulative time spent in the 'Congestion  
Limited' state
+ * *!TotalTestTime* - [NDTTestMethodology#Total_test_time Total test time]

 === 'Receiver Limited' state time share ===

+The 'Receiver Limited' state time share is the percentage of the time that  
the NDT Server was limited in sending due to the NDT Client's receive  
window.
+
 The 'Receiver Limited' state time share is computed using the following  
formula:

 {{{
@@ -437,12 +438,13 @@
 }}}

 where:
- * *!TotalTestTime* - [NDTTestMethodology#Total_test_time Total test time]
  * *!SndLimTimeRwin* - The cumulative time spent in the 'Receiver Limited'  
state
-
+ * *!TotalTestTime* - [NDTTestMethodology#Total_test_time Total test time]

 === 'Sender Limited' state time share ===

+The 'Sender Limited' state time share is the percentage of the time that  
the NDT Server was limited in sending due to its own fault.
+
 The 'Sender Limited' state time share is computed using the following  
formula:

 {{{
@@ -450,8 +452,8 @@
 }}}

 where:
- * *!TotalTestTime* - [NDTTestMethodology#Total_test_time Total test time]
  * *!SndLimTimeSender* - The cumulative time spent in the 'Sender Limited'  
state
+ * *!TotalTestTime* - [NDTTestMethodology#Total_test_time Total test time]

 == Known issues/limitations ==