Latency based platform coordination

Abstract

In some embodiments, an electronic apparatus comprises at least one processor, a plurality of components, and a policy engine comprising logic to receive latency data from one or more components in the electronic device, compute a minimum latency tolerance value from the latency data, and determine a power management policy from the minimum latency tolerance value.

1 . A method to implement latency based platform coordination in an electronic device, comprising:
 receiving, in a policy engine, latency data from one or more components in the electronic device;   computing a minimum latency tolerance value from the latency data; and   determining a power management policy from the minimum latency tolerance value.   
   
   
       2 . The method of  claim 1 , wherein receiving, in a policy engine, latency data from one or more components in the electronic device comprises receiving a snoop latency tolerance and a non-snoop latency tolerance from the one or more components 
   
   
       3 . The method of  claim 2 , wherein:
 the latency data from the one or more components is transmitted via an intermediate bridge/switch device   the bridge has at least one delay value for data transmitted via the bridge/switch device; and   the bridge deducts the delay value from the latency data.   
   
   
       4 . The method of  claim 3 , wherein:
 the bridge comprises a first delay value when the bridge is in a low power state and a second delay value when the bridge is in an active power state; and   the bridge deducts one of the first delay value or the second delay value from the latency data.   
   
   
       5 . The method of  claim 1 , wherein computing a minimum latency tolerance value from the latency data comprises:
 comparing a plurality of latency values received from a plurality of components; and   selecting the lowest latency value from the plurality of latency values.   
   
   
       6 . The method of  claim 1 , wherein the policy engine monitors latency values over time during operation of the electronic device and updates power management policies as a function of changes in the latency tolerance values. 
   
   
       7 . The method of  claim 1 , wherein determining a power management policy from the minimum latency tolerance value comprises selecting a sleep state that permits the system to meet the minimum latency tolerance value. 
   
   
       8 . An electronic apparatus, comprising:
 at least one processor;   a plurality of components; and   a policy engine comprising logic to:
 receive latency data from one or more components in the electronic device; 
 compute a minimum latency tolerance value from the latency data; and 
 determine a power management policy from the minimum latency tolerance value. 
   
   
   
       9 . The electronic apparatus of  claim 8 , wherein the policy engine further comprises logic to receive a snoop latency tolerance and a non-snoop latency tolerance from the one or more components 
   
   
       10 . The electronic apparatus of  claim 9 , wherein:
 the latency data from the one or more components is transmitted via an intermediate bridge/switch device   the bridge has at least one delay value for data transmitted via the bridge/switch device; and   the bridge deducts the delay value from the latency data.   
   
   
       11 . The electronic apparatus of  claim 10 , wherein:
 the bridge comprises a first delay value when the bridge is in a low power state and a second delay value when the bridge is in an active power state; and   the bridge deducts one of the first delay value or the second delay value from the latency data.   
   
   
       12 . The electronic apparatus of  claim 8 , wherein the policy engine further comprises logic to:
 compare a plurality of latency values received from a plurality of components; and   select the lowest latency value from the plurality of latency values.   
   
   
       13 . The electronic apparatus of  claim 8 , wherein the policy engine further comprises logic to monitor latency values over time during operation of the electronic device and updates power management policies as a function of changes in the latency tolerance values. 
   
   
       14 . The electronic apparatus of  claim 8 , wherein the policy engine further comprises logic to select a sleep state that permits the system to meet the minimum latency tolerance value.