Terminal Services Session Object

Article
10/08/2009

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

The Terminal Services Session performance object provides per-session resource statistics, such as packet and frame transmission data, errors, and cache activity for Terminal Services.

In addition, the Terminal Services Session performance object reports session-specific activity using the following Process object counters:

Process Object	Process Object
Process Object	Process Object
Process Object	Process Object
Process Object	Process Object
Process Object	Process Object
Process Object	Process Object
Process Object	Process Object
Process Object

Counter Name	Description	Counter Type
Input Async Frame Error	Shows the number of input async framing errors. These can be caused by a noisy transmission line. Using a smaller packet size can help in some cases.	PERF_COUNTER_RAWCOUNT
Input Async Overflow	Shows the number of input async overflow errors. These can be caused by a lack of buffer space available on the host.	PERF_COUNTER_RAWCOUNT
Input Async Overrun	Shows the number of input async overrun errors. These can be caused by the baud rate being faster than the computer can handle, or by a serial line that does not use a 16550 universal asynchronous receiver-transmitter (UART). Overruns can also occur if too many high speed serial lines are active at one time for the processor's power.	PERF_COUNTER_RAWCOUNT
Input Async Parity Error	Shows the number of input async parity errors. These can be caused by a noisy transmission line.	PERF_COUNTER_RAWCOUNT
Input Bytes	Shows the number of bytes input on this session, which includes all protocol overhead.	PERF_COUNTER_COUNTER
Input Compress Flushes	Shows the number of input compression dictionary flushes. When the data cannot be compressed, the compression dictionary is flushed so that newer data has a better chance of being compressed. One possible cause of data not compressing is transferring compressed files using client drive mapping.	PERF_COUNTER_RAWCOUNT
Input Compressed Bytes	Shows the number of bytes that were input after compression. This number compared with the Total Bytes input is the compression ratio.	PERF_COUNTER_COUNTER
Input Compression Ratio	Shows the compression ratio of the server input data stream. This is Input Compressed Bytes compared with the Total Bytes input.	PERF_COUNTER_RAWCOUNT
Input Errors	Shows the number of input errors of all types. Some examples of input errors are lost acknowledgments (ACKs) or badly formed packets.	PERF_COUNTER_RAWCOUNT
Input Frames	Shows the number of frames input on this session.	PERF_COUNTER_COUNTER
Input Timeouts	Shows the total number of timeouts on the communication line, as seen from the client side of the connection. These are typically the result of a noisy line. On some high-latency networks, this could be the result of the protocol timeout being too short. Increasing the protocol timeout on these types of lines will improve performance by reducing the need for retransmissions.	PERF_COUNTER_RAWCOUNT
Input Transport Errors	Shows the number of Terminal Services transport-level errors on input.	PERF_COUNTER_RAWCOUNT
Input WaitForOutBuf	Shows the number of times that a "wait for an available send buffer" was done by the protocols on the client side of the connection.	PERF_COUNTER_RAWCOUNT
Input WdBytes	Shows the number of bytes input on this session after all protocol overhead has been removed.	PERF_COUNTER_COUNTER
Input WdFrames	Shows the number of frames input after any additional protocol added frames have been removed.	PERF_COUNTER_COUNTER
Output Async Frame Error	Shows the number of output async framing errors. These could be caused by a hardware or line problem.	PERF_COUNTER_RAWCOUNT
Output Async Overflow	Shows the number of output async overflow errors.	PERF_COUNTER_RAWCOUNT
Output Async Overrun	Shows the number of output async overrun errors.	PERF_COUNTER_RAWCOUNT
Output Async Parity Error	Shows the number of output async parity errors. These can be caused by a hardware or line problem.	PERF_COUNTER_RAWCOUNT
Output Bytes	Shows the number of bytes output on this session, which includes all protocol overhead.	PERF_COUNTER_COUNTER
Output Compress Flushes	Shows the number of output compression dictionary flushes. When the data cannot be compressed, the compression dictionary is flushed so that newer data has a better chance of being compressed. One possible cause of data not compressing is transferring compressed files using client drive mapping.	PERF_COUNTER_RAWCOUNT
Output Compressed Bytes	Shows the number of bytes output after compression. This number compared with the Total Bytes output is the compression ratio.	PERF_COUNTER_COUNTER
Output Compression Ratio	Shows the compression ratio of the server output data stream. Output Compressed Bytes compared with the Total Bytes output is the compression ratio.	PERF_COUNTER_RAWCOUNT
Output Errors	Shows the number of output errors of all types. Some examples of output errors are lost ACKs or badly formed packets.	PERF_COUNTER_RAWCOUNT
Output Frames	Shows the number of frames that were output on this session.	PERF_COUNTER_COUNTER
Output Timeouts	Shows the total number of timeouts on the communication line, from the host side of the connection. These are typically the result of a noisy line.	PERF_COUNTER_RAWCOUNT
Output Transport Errors	Shows the number of Terminal Services transport-level errors on output.	PERF_COUNTER_RAWCOUNT
Output WaitForOutBuf	Shows the number of times that a "wait for an available send buffer" was done by the protocol on the server side of the connection.	PERF_COUNTER_COUNTER
Output WdBytes	Shows the number of bytes output on this session after all protocol overhead has been removed.	PERF_COUNTER_COUNTER
Output WdFrames	Shows the number of frames output before any additional protocol frames have been added.	PERF_COUNTER_COUNTER
Protocol Bitmap Cache Hit Ratio	Shows the hit ratio in the protocol bitmap cache. A higher hit ratio means better performance, since data transmissions are reduced. Low hit ratios are due to the screen updating with new information that is either not re-used, or is flushed out of the client cache.	PERF_COUNTER_RAWCOUNT
Protocol Bitmap Cache Hits	Shows the number of hits in the protocol bitmap cache.	PERF_COUNTER_RAWCOUNT
Protocol Bitmap Cache Reads	Shows the number of references to the protocol bitmap cache.	PERF_COUNTER_RAWCOUNT
Protocol Brush Cache Hit Ratio	Shows the hit ratio in the protocol brush cache.	PERF_COUNTER_RAWCOUNT
Protocol Brush Cache Hits	Shows the number of hits in the protocol brush cache.	PERF_COUNTER_RAWCOUNT
Protocol Brush Cache Reads	Shows the number of references to the protocol brush cache.	PERF_COUNTER_RAWCOUNT
Protocol Glyph Cache Hit Ratio	Shows the hit ratio in the protocol glyph cache.	PERF_COUNTER_RAWCOUNT
Protocol Glyph Cache Hits	Shows the number of hits in the protocol glyph cache.	PERF_COUNTER_RAWCOUNT
Protocol Glyph Cache Reads	Shows the number of references to the protocol glyph cache.	PERF_COUNTER_RAWCOUNT
Protocol Save Screen Bitmap Cache Hit Ratio	Shows the hit ratio in the protocol save screen bitmap cache.	PERF_COUNTER_RAWCOUNT
Protocol Save Screen Bitmap Cache Hits	Shows the number of hits in the protocol save screen bitmap cache.	PERF_COUNTER_RAWCOUNT
Protocol Save Screen Bitmap Cache Reads	Shows the number of references to the protocol save screen bitmap cache.	PERF_COUNTER_RAWCOUNT
Total Async Frame Error	Shows the total number of async framing errors.	PERF_COUNTER_RAWCOUNT
Total Async Overflow	Shows the total number of async overflow errors.	PERF_COUNTER_RAWCOUNT
Total Async Overrun	Shows the total number of async overrun errors.	PERF_COUNTER_RAWCOUNT
Total Async Parity Error	Shows the total number of async parity errors.	PERF_COUNTER_RAWCOUNT
Total Bytes	Shows the total number of bytes on this session, which includes all protocol overhead.	PERF_COUNTER_COUNTER
Total Compress Flushes	Shows the total number of compression dictionary flushes.	PERF_COUNTER_RAWCOUNT
Total Compressed Bytes	Shows the total number of bytes after compression. This number compared with the Total Bytes output is the compression ratio.	PERF_COUNTER_COUNTER
Total Compression Ratio	Shows the total compression ratio of the server data stream. This is the Total Compressed Bytes compared with the Total Bytes output.	PERF_COUNTER_RAWCOUNT
Total Errors	Shows the total number of errors of all types.	PERF_COUNTER_RAWCOUNT
Total Frames	Shows the total number of frames on this session.	PERF_COUNTER_COUNTER
Total Protocol Cache Hit Ratio	Shows the overall hit ratio for all protocol caches.	PERF_COUNTER_RAWCOUNT
Total Protocol Cache Hits	Shows the total hits in all protocol caches. The protocol caches Windows objects that are likely to be re-used, to avoid having to resend them on the transmission line. Examples of objects are Windows icons and brushes. Hits in the cache represent objects that did not need to be resent.	PERF_COUNTER_RAWCOUNT
Total Protocol Cache Reads	Shows the total references to all protocol caches.	PERF_COUNTER_RAWCOUNT
Total Timeouts	Shows the total number of timeouts on the communication line, from both the host and client sides of the connection.	PERF_COUNTER_RAWCOUNT
Total Transport Errors	Shows the total number of Terminal Services transport-level errors.	PERF_COUNTER_RAWCOUNT
Total WaitForOutBuf	Shows the number of times that a "wait for an available send buffer" was done by the protocols on both the server and client sides of the connection.	PERF_COUNTER_COUNTER
Total WdBytes	Shows the total number of bytes on this session after all protocol overhead has been removed.	PERF_COUNTER_COUNTER
Total WdFrames	Shows the total number of frames input and output before any additional protocol frames have been added.	PERF_COUNTER_COUNTER

Terminal Services Object

Terminal Services Session Object

Additional resources