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c658764dec
https://bugzilla.redhat.com/show_bug.cgi?id=1624223 There are two ways to request memory preallocation on cmd line: -mem-prealloc and .prealloc attribute for a memory-backend-file. However, as it turns out it's not safe to use both at the same time. If -mem-prealloc is used then qemu will fully allocate the memory (this is done by actually touching every page that has been allocated). Then, if .prealloc=yes is specified, mbind(flags = MPOL_MF_STRICT | MPOL_MF_MOVE) is called which: a) has to (possibly) move the memory to a different NUMA node, b) can have no effect when hugepages are in play (thus ignoring user request to place memory on desired NUMA nodes). Prefer -mem-prealloc as it is more backward compatible compared to switching to "-numa node,memdev= + -object memory-backend-file". Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: John Ferlan <jferlan@redhat.com>
31 lines
877 B
Plaintext
31 lines
877 B
Plaintext
LC_ALL=C \
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PATH=/bin \
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HOME=/home/test \
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USER=test \
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LOGNAME=test \
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QEMU_AUDIO_DRV=none \
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/usr/bin/qemu-system-x86_64 \
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-name fedora \
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-S \
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-machine pc-i440fx-2.3,accel=tcg,usb=off,dump-guest-core=off \
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-m size=1048576k,slots=16,maxmem=1099511627776k \
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-smp 2,sockets=2,cores=1,threads=1 \
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-mem-prealloc \
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-mem-path /dev/hugepages2M/libvirt/qemu/-1-fedora \
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-numa node,nodeid=0,cpus=0-1,mem=1024 \
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-object memory-backend-file,id=memdimm0,\
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mem-path=/dev/hugepages1G/libvirt/qemu/-1-fedora,size=1073741824,\
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host-nodes=1-3,policy=bind \
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-device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0 \
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-uuid 63840878-0deb-4095-97e6-fc444d9bc9fa \
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-display none \
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-no-user-config \
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-nodefaults \
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-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-fedora/monitor.sock,\
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server,nowait \
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-mon chardev=charmonitor,id=monitor,mode=control \
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-rtc base=utc \
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-no-shutdown \
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-no-acpi \
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-usb
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