The problem with SLAs
Monday, May 03, 2010
11:12 AM
The problem with SLAs….
… is that performance bounds are absolute…
… while response times are probabilistic…
E.g., response time < 2 seconds. 
Simple proposal (HotPower 2008): 
Make the SLA probabilistic, e.g., 
< 2 seconds 90% of the time
< 10 seconds 100% of the time. 
Result: dramatic power savings. 