System Bus

If you suspect that bus saturation is affecting your server, you can monitor its activity on Pentium and Pentium Pro servers and then change your server's configuration as necessary. To view Pentium counters, run the Pperf utility in the P5ctrs directory that is available on the Microsoft Windows NT Resource Kit compact disc.

The following are important bus counters for Microsoft Exchange Server.

Object	Counter
Pentium	Bus Utilization (clks)/sec
	% Code Cache Misses
	% Data Cache Misses

If your system bus is near saturation, you have two options:

• Use larger CPU caches if there are many cache misses
• Split the load onto multiple servers. Start by offloading any non-Microsoft Exchange Server services, if they are being used.

Summary of Recommendations

• Use larger L2 caches.
• Consider using multiple servers.