Data direct I/O

A4: Microarchitecture-Aware LLC Management for Datacenter Servers with Emerging I/O Devices
This work uncovers two previously unknown sources of Last-Level Cache (LLC) contention in Intel Xeon CPUs caused by high-bandwidth I/O devices and proposes A4, a runtime LLC management framework that mitigates these issues. A4 improves performance for latency-sensitive workloads by 51% without significantly affecting low-priority workloads.
Haneul Park, Jiaqi Lou, Sangjin Lee, Yifan Yuan, KyoungSoo Park, Yongseok Son, Ipoom Jeong, Nam Sung Kim
A4: Microarchitecture-Aware LLC Management for Datacenter Servers with Emerging I/O Devices