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UID:pretalx-kvm-forum-2024-NYWTMH@pretalx.com
DTSTART;TZID=CET:20240923T094500
DTEND;TZID=CET:20240923T101500
DESCRIPTION:Intel client platforms from Alderlake have begun to leverage hy
 brid CPU architectures\, and hybrid CPU architectures can achieve a good b
 alance of performance and power on bare metal. However\, VMs are still una
 ble to take advantage of the hybrid CPU architecture\, not only because QE
 MU/KVM is unable to expose the P-core/E-core difference for VMs\, but also
  because the P-core/E-core feature difference further blocks hybrid suppor
 t in Guest. As a result\, VM performance on hybrid platforms is very gappe
 d from bare metal\, and CPU features are not fully supported in Guest (e.g
 . PMU\, which is disabled by KVM on hybrid platforms). \n\nTo address this
 \, our presentation will mainly have the following aspects:\n\n* Illustrat
 e our proposal on how to design the QEMU API to allow users to create a hy
 brid CPU/cache topology for Guest\, with flexible CPU type configurations.
  This allows Guest to realize the difference between the P-core/E-core typ
 e of the vCPU and different cache topologies. We achieve this by abstracti
 ng the topology device in QOM way to refactor current QEMU general topolog
 y implementation. We will also specifically describe our QOM-topology impl
 ementation and how it would help QEMU to improve the general topology subs
 ystem.\n\n* Present of our exploratory experience on VM performance optimi
 zation method could be applied for the VM with hybrid vCPUs. On Intel clie
 nt platforms\, there's ITD/ITMT\, etc.\, which could optimize workload in 
 VM based on hybrid CPU/cache topology.\n\nIn summary\, this presentation w
 ill cover all aspects of reaching optimal CPU virtualization on hybrid pla
 tform for both performance and features.
DTSTAMP:20260305T205507Z
LOCATION:Hall C+D
SUMMARY:The Road to Optimal CPU Virtualization on Hybrid Platform - Zhao Li
 u\, Zhenyu Wang
URL:https://pretalx.com/kvm-forum-2024/talk/NYWTMH/
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