libvirt/qemuxml2argv-hugepages-pages5.args at adac88c3473044545718505fa5b98835084faa91 - libvirt - Gitea

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Michal Privoznik 281f70013e qemu: Honor hugepages for UMA domains

https://bugzilla.redhat.com/show_bug.cgi?id=1135396

There are two ways how to tell qemu to use huge pages. The first one
is suitable for domains with NUMA nodes: the path to hugetlbfs mount
is appended to NUMA node definition on the command line. The second
one is suitable for UMA domains: here there's this global '-mem-path'
argument that accepts path to the hugetlbfs mount point. However, the
latter case was not used for all the cases that it should be. For
instance:

  <memoryBacking>
    <hugepages>
      <page size='2048' unit='KiB' nodeset='0'/>
    </hugepages>
  </memoryBacking>

didn't trigger the '-mem-path' so the huge pages - despite being
configured - were not used at all.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

2014-09-17 18:33:33 +02:00

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 LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
 /usr/bin/qemu -S -M pc -m 1024 \
 -mem-prealloc \
 -mem-path /dev/hugepages2M/libvirt/qemu \
 -smp 2 -nographic \
 -monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -usb \
 -hda /dev/HostVG/QEMUGuest1 -net none -serial none -parallel none