Seminar Details
2025-10-09 (13:00) : Sloth: A Kernel-Bypass Scheduler Maximizing Energy Efficiency under Latency Constraints
At Shannon, Maxwell a.105
Organized by Computer Science and Engineering
Speaker :
Clément Delzotti (ICTEAM/UCLouvain)
Abstract :
In recent years, multi-hundred-gigabit networking
applications such as Virtual Network Function (VNF) and Key
Value Store (KVS) implementations have relied on kernel-bypass
and polling to achieve maximum throughput. However, this
performance improvement comes at the expense of high CPU
usage and power consumption.
This paper first analyses the trade-off between the power
consumption, the latency and the throughput of VNF applica-
tions. We then present Sloth, an energy-aware scheduler that
adapts the number of cores used by an application and their
frequency. Sloth uses the information gathered in a training phase
to maximize the energy reduction in real time while maintaining
a user-provided service-level objective. Sloth manages to reduce
CPU power consumption by up to 50% compared to the classical
DPDK polling approach with only a 30 μs latency increase. Sloth
also saves up to milliseconds of latency compared to state-of-the-
art solutions at equivalent power consumption