KVM AVIC Support Coming To Linux 4.7 For Improving AMD Virtualization Performance
Written by Michael Larabel in Virtualization on 19 May 2016 at 09:56 AM EDT. 2 Comments
VIRTUALIZATION --
The Kernel-based Virtual Machine (KVM) code for Linux 4.7 is adding x86 AVIC support for further optimizing virtualization performance. AVIC is of relevance to AMD's Carrizo hardware and newer.

AVIC is short for Advanced Virtual Interrupt Controller and is designed for reducing interrupt overhead in virtualized environments. AVIC is AMD's alternative to Intel's APICv for APIC virtualization. AMD announced AVIC a few years ago but it's only with Carrizo processors and newer where it's supported.

The kernel patches for SVM AVIC do mention some performance figures for the benefit of this feature being implemented for KVM. The performance results show improvements in Hackbench for IPI performance but will yield smaller gains in performance for workloads not generating large numbers of interrupts.

AVIC is landing in Linux 4.7 via the KVM pull request. Aside from the KVM Advanced Virtual Interrupt Controller support, there doesn't appear to be anything else too significant feature-wise as part of this 4.7 KVM pull request.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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