Timestamp Definitions and Values in the Request
The following table provides an explanation for each of
the values in the [timestamp] section of the request:
| Value | Description |
|---|---|
RequestTimeEx |
Start of the request. The timestamp when the DNCA saw the first packet of the request. |
RequestEndTimeEx |
End of the request. The timestamp when the DNCA saw the last packet of the request. |
ResponseStartTimeEx |
Start of the response. The timestamp when the DNCA saw the first packet of the response. If no response packets were seen, then the RequestEndTimeEx value will be used. |
ResponseTimeEx |
End of the response. The timestamp when the DNCA saw the last packet of the response. If no response packets were seen, then the RequestEndTimeEx value will be used. |
ResponseAckTimeEx |
Timestamp when the DNCA saw that client/browser acknowledged the last TCP packet of the response. If no response packets were seen, then the RequestEndTimeEx value will be used. |
TLapiArrivalTimeEx |
This timestamp indicates when the hit arrives
within the DNCA's pipelined process. The completed reassembled hit
time may be much later if an incomplete hit was reassembled or was
delayed due to a very late last data packet. In an otherwise normal
case, this timestamp should be roughly the same as the ResponseTimeEx.
A large difference could indicate a network issue. |
ReqTTLB |
Time in microseconds from the first packet of
the request to the last packet of the request (RequestEndTimeEx minus RequestTimeEx).
This value does not include network time. |
RspTTFB |
Time (in microseconds) from the start of the
request to the first of the response page (ResponseTimeStartEx minus RequestTimeEx).
This value is usually an accurate approximation of the time that the
Web server required to generate the response page. In particular,
if the entire page is buffered (the default for ASP .NET and many
J2EE environments), then this measurement is an exact predictor of
how long the server-side infrastructure took to respond.This value may not be accurate if the Web server served the data in chunks. |
RspTTLB |
Time in microseconds from the first packet of
the response to the last packet of the response (ResponseTimeEx minus ResponseStartTimeEx).
This value does not include network time. |
RspTDCA |
Client/browser acknowledgement time of the last
data packet (ResponseACKTimeEx minus ResponseTimeEx).
This value is an indication of network round trip.To compute one-way time, divide this value by 2. |
ConnSpeed |
Connection speed, specified in bits per second
(bps). This value is calculated by dividing the average size of the
response by the average time it took to deliver. When determining connection speed, any detected client user interface events are ignored. |
ConnType |
Based on the ConnSpeed setting, this value is
set to Dialup, ISDN, DSL,
or T1. |
WS_Generation |
Time in microseconds for the web server to generate
the response. This value is computed as: ResponseStartTimeEx - RequestEndTimeEx |
WS_Grade |
The grade assigned to the web server page generation
time (WS_Generation). Possible values are the following: ExcellentWS, Very
GoodWS, GoodWS, FairWS, PoorWS,
or IncompleteWS.This value is indexed by default. |
WS_GradeEx |
A number representing the TimeGrades time range grouping between
0 and 4 for web server page generation time. See Pipeline Settings. |
NT_Total |
Time in microseconds for the network travel time. |
NT_Grade |
The grade assigned to the network travel time
(NT_Total). Possible values are the following: ExcellentNT, Very
GoodNT, GoodNT, FairNT, PoorNT,
or IncompleteNT.This value is indexed by default. |
NT_GradeEx |
A number representing the TimeGrades time range
grouping between 0 and 4 for network
travel time. |
RT_Total |
The total round trip travel time in microseconds. |
RT_Grade |
The overall grade for network performance. Possible
values are the following: ExcellentRT, Very
GoodRT, GoodRT, FairRT, PoorRT,
or IncompleteRT.This value is indexed by default. |
RT_GradeEx |
A number representing the TimeGrades time range grouping between
0 and 4 for round trip travel time. See Pipeline Settings. |