LoadTestResultsCollectorTimeoutException

One or more performance counters could not be collected......

Exception - LoadTestResultsCollectorTimeoutException
One or more performance counters could not be collected within the sampling interval; their values will not be graphed.  To avoid this error, reduce the number of performance counter categories collected or increase the sample rate.

We checked through load test analyzer that counters  are not able to come from which machine? Is it agent box / web server box / some other box? Is it overloaded during that time? This issue generally comes when a machine becomes too busy that it is not able to return counters within sampling  interval.

1. If we are not analyzing the counters of remote machine performance, then
2. As per answer at http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=267603&SiteID=1

I updated Locally setting as highlighted in Red (edit <Program Files>\Microsoft Visual Studio 8\Common7\IDE\VSTestHost.exe.config)

 <?xml version ="1.0"?>

<configuration>

    <runtime>

        <assemblyBinding xmlns="urnchemas-microsoft-com:asm.v1">

            <probing privatePath="PrivateAssemblies;PublicAssemblies"/>

        </assemblyBinding>

    </runtime>

    <appSettings>

       <add key="LoadTestCounterCategoryReadTimeout" value="7000"/>

    </appSettings>

</configuration>