SCO Unixware Release 7.1.4 

          After installing the ptf9052e or ptf9052f versions of the UnixWare 
          7.1.4 Maintenance Pack 3 Supplement, my system hangs. 

          In some cases, where a system health monitoring software agent is 
          enabled to automatically reboot an unresponsive system, customers 
          have experienced unexpected reboots.

          Ptf9052e (and ptf9052f) included an increase in the kernel clock 
          tick rate, from a fixed rate of 100 to a configurable rate with a 
          default of 1000. 

          The default clock tick rate can be overridden by setting the kernel 
          boot parameter KHZ to one of several permitted values (100, 200, 
          500, 1000, 2000). 
           
          Setting the system clock interrupt rate to a higher frequency, as is 
          done by installing ptf9052e and ptf9052f, may be related to some 
          system hangs or reboots reported to SCO, as described above. These 
          issues are under investigation. 
           
          To restore the interrupt clock rate back to the previous default 
          value of 100 Hz, either install ptf9052g (or later) or set the clock 
          rate manually by adding: 
           
             KHZ=100 
           
          on a line by itself to the file /stand/boot and rebooting the system.

          At this time, the only application that requires the system 
          interrupt clock rate to be increased is MergePRO Desktop Edition. 
           
          Default tunable parameter values are acceptable for most 
          configurations and applications. If your application has special 
          performance needs, you should use care when adjusting tunable values 
          and verify the the application and system are operating correctly.