yes its called bandwidth throttling, try the help files, although it does pertain to iis and web servers
This article was previously published under Q238145
SUMMARY
When you enable bandwidth throttling, Internet Information Services (IIS) activates a set of counters to monitor it in System Monitor (SysMon). These counters can be identified by "Async I/O" in the counter name. These counters are active only when bandwidth throttling is enabled. (If bandwidth throttling is not enabled, the counters appear in SysMon, but they always have a value of zero.)
MORE INFORMATION
The Async I/O counters are part of the Internet Information Services Global performance object. They represent totals for all of the IIS services. Bandwidth is not measured for each service. The following table lists and describes the Async I/O counters.
Counter Indicates
Internet Information Services Global: Current Blocked Async I/O Requests The number of requests blocked (that is, held in a buffer until bandwidth is available) by bandwidth throttling as reported during the most recent observation.
Internet Information Services Global: Total Allowed Async I/O Requests The number of requests allowed by bandwidth throttling since the service was last started.
Internet Information Services Global: Total Blocked Async I/O Requests The number of requests blocked (that is, held in a buffer until bandwidth is available) by bandwidth throttling since the service was last started.
Internet Information Services Global: Total Rejected Async I/O Requests The number of requests rejected by bandwidth throttling since the service was last started.
Internet Information Services Global: Measured Async I/O Bandwidth Usage/Minute The number of bytes sent per minute as indicated by a sample taken by bandwidth throttling.