Boosting techniques have been widely adopted in commercial multicore and manycore systems, mainly because they provide means to satisfy performance requirements surges, for one or more cores, at run-time. Current boosting techniques select the boosting levels (for boosted cores) and the throttle-down levels (for non-boosted cores) either arbitrarily or through step-wise control approaches. These methods might result in unnecessary performance losses for the non-boosted cores, in short boosting intervals, in failing to satisfy the required performance surges, or in unnecessary high power and energy consumption. This paper presents an efficient and lightweight run-time boosting technique based on transient temperature estimation, called seBoost. Our technique guarantees meeting the performance requirements surges at run-time, thus maximizing the boosting time with a minimum loss of performance for the non-boosted cores.