Monitoring and Tuning Your Server

Monitor Settings and Relevant Counters for Transmission Rates

The following tables list and describe some of the counters that can be used for measuring transmission rates. The counters in these tables display the transmission rate observed during the last sample interval. They do not display a rolling or cumulative average of the rate. Also, the counters that represent sums of other counters, such as IP\ Datagrams/sec, are simple sums of the other counters’ values.

For more information about how counter values are calculated, check the counter type. A counter type determines how PerfMon calculates and displays that particular counter.

Table 5.7 lists and describes counters at the Application Layer.

Table 5.7 Counters for Measuring Transmission Rates at the Application Layer

Counter	Indicates
Web Service\ Bytes Sent/sec	The rate at which the HTTP server application is sending data, in bytes.
Web Service\ Bytes Received/sec	The rate at which the HTTP server application is receiving data, in bytes.
Web Service\ Bytes Total/sec	The rate at which the HTTP server application is sending and receiving data, in bytes; the sum of Web Service\ Bytes Sent/sec and Web Service\ Bytes Received/sec.
FTP Service\ Bytes Sent/sec	The rate at which the FTP server application is sending data, in bytes.
FTP Service\ Bytes Received/sec	The rate at which the FTP server application is receiving data, in bytes.
FTP Service\ Bytes Total/sec	The rate at which the FTP server application is sending and receiving data, in bytes; the sum of FTP Service\ Bytes Sent/sec and FTP Service\ Bytes Received/sec.
SMTP Service\ Bytes Sent/sec	The rate at which the SMTP server application is sending data, in bytes.
SMTP Service\ Bytes Received/sec	The rate at which the SMTP server application is receiving data, in bytes.
SMTP Service\ Bytes Total/sec	The rate at which the SMTP server application is sending and receiving data, in bytes; the sum of SMTP Service\ Bytes Sent/sec and SMTP Service\ Bytes Received/sec.

Table 5.8 lists and describes counters on the TCP object.

Table 5.8 Counters for Measuring Transmission Rates at the Transport Layer

Counter	Indicates
TCP\ Segments Sent/sec	The rate at which TCP segments are sent by using the TCP protocol.
TCP\ Segments Received/sec	The rate at which TCP segments are received by using the TCP protocol.
TCP\ Segments/sec	The sum of Segments Sent/sec and Segments Received/sec.
TCP\ Segments Retransmitted/sec	The rate at which segments are transmitted that contain one or more bytes TCP recognizes as having been transmitted before. Segments Retransmitted/sec is a proper subset of Segments Sent/sec and Segments/sec. To determine the proportion of transmissions caused by failed transmission attempts, divide Segments Retransmitted/sec by Segments Sent/sec.

Table 5.9 lists and describes counters on the IP object.

Table 5.9 Counters for Measuring Transmission Rates at the Network Layer

Counter	Indicates
IP\ Datagrams Sent/sec	The rate at which IP datagrams are sent by using the IP protocol. This counter does not include datagrams forwarded to another server.
IP\ Datagrams Received/sec	The rate at which IP datagrams are received from IP by using IP protocol. This counter does not include datagrams forwarded to another server.
IP\ Datagrams/sec	The sum of IP\ Datagrams Sent/sec and IP\ Datagrams Received/sec.
IP\ Datagrams Forwarded/sec	The rate at which IP datagrams are forwarded to their final destination by the server.

The sum of IP: Datagrams/sec and IP: Datagrams Forwarded/sec represents the rate at which all IP datagrams are handled by the server.

Table 5.10 lists and describes counters on the Network Interface performance object.

Table 5.10 Counters for Measuring Transmission Rates at the Data Link Layer

Counter	Indicates
Network Interface\ Bytes Sent/sec: Adapter#	The rate at which bytes are sent over each network adapter. The counted bytes include framing characters.
Network Interface\ Bytes Received/sec: Adapter#	The rate at which bytes are received over each network adapter. The counted bytes include framing characters.
Network Interface\ Bytes Total/sec: Adapter#	The sum of Network Interface\ Bytes Sent/sec and Network Interface\ Bytes Received/sec.

The Network Interface counters display data about the network adapters on the server computer. The first instance of the Network Interface object that you see in PerfMon represents the loopback. The loopback is a local path through the protocol driver and the network adapter. All other instances represent installed network adapters.