June 2017
Intermediate to advanced
340 pages
8h 22m
English
Content preview from KVM Virtualization Cookbook
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NUMA tuning with libvirt
NUMA is a technology that allows the system memory to be divided into zones, also named nodes. The NUMA nodes are then allocated to particular CPUs or sockets. In contrast to the traditional monolithic memory approach, where each CPU/core can access all the memory regardless of its locality, usually resulting in larger latencies, NUMA bound processes can access memory that is local to the CPU they are being executed on. In most cases, this is much faster than the memory connected to the remote CPUs on the system.
Libvirt uses the libnuma library to enable NUMA functionality for virtual machines, as we can see here:
root@kvm:~# ldd /usr/sbin/libvirtd | grep numa libnuma.so.1 => /usr/lib/x86_64-linux-gnu/libnuma.so.1 ...
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