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Wednesday, October 28 • 12:00 - 12:50
Virtual Topology for Virtual Machines: Friend or Foe? - Dario Faggioli, SUSE

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Being able to craft a detailed virtual topology for a VM may be crucial for achieving good performance. But it is also risky, as interfaces become more complex, and an inconsistent configuration may be selected, causing more harm than good.

E.g., it would be good to be able to specify the size of caches, for cases when some software (e.g., glibc) inside the VM checks it and decides whether or not to enable some optimizations depending right on that.

On the other hand, even just defining the vCPUs topology (threads, cores, NUMA nodes, etc) may lead to less stable or outright worse performance, if the vCPUs and the memory of the VM are not properly pinned at the host level.

In this talk, we will show some first-hand examples, we will outline what is currently there in Linux, libvirt and QEMU and we will discuss if it is possible to improve things even further.

Speakers
avatar for Dario Faggioli

Dario Faggioli

Virtualization Specialist, SUSE
Dario is a Virtualization Software Engineer at SUSE. He's been active in the Open Source virtualization space for a few years. Within the Xen-Project, he is still the maintainer of the Xen hypervisor scheduler. He also works on Linux kernel, KVM, Libvirt, and QEMU. Back during his... Read More →



Wednesday October 28, 2020 12:00 - 12:50 GMT
KVM Theater
  OSS - KVM Forum Track