Bug 1030279 - RHEL7.0 only support 64 numa node
RHEL7.0 only support 64 numa node
Status: CLOSED NOTABUG
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm (Show other bugs)
7.0
x86_64 Linux
medium Severity medium
: rc
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Assigned To: Virtualization Maintenance
Virtualization Bugs
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Depends On:
Blocks:
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Reported: 2013-11-14 04:42 EST by FuXiangChun
Modified: 2013-11-14 07:08 EST (History)
7 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-11-14 07:08:44 EST
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description FuXiangChun 2013-11-14 04:42:46 EST
Description of problem:
Boot guest with more than 64 numa nodes, qemu will show "qemu: too many NUMA nodes".  RHEL7.0 support Max vcpu number is 255(the recommended cpus is 160), so qemu-kvm should support numa number >=160

Version-Release number of selected component (if applicable):
qemu-kvm-1.5.3-19.el7.x86_64
3.10.0-48.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. /usr/libexec/qemu-kvm -M q35 -cpu Opteron_G4 -enable-kvm -m 20G  -smp 80 ....-numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node -numa node(65)
2.
3.

Actual results:
qemu: too many NUMA nodes


Expected results:
qemu-kvm boot successfully. and can support >=160 numa nodes

Additional info:
Comment 2 Andrew Jones 2013-11-14 07:08:44 EST
(In reply to FuXiangChun from comment #0)
> Expected results:
> qemu-kvm boot successfully. and can support >=160 numa nodes

Why? Does a config like that make any sense? If so, then please point to the use case / customer request.

64 is the current limit. Since 64 appears to work, then I'm closing this as not-a-bug. Note, there's an upstream patch (still pending) that could bump it to 128 at some point, but that's unlikely to be merged and backported for 7.0.

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