Bug 1010881 - backport vcpu soft limit warning
Summary: backport vcpu soft limit warning
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Andrew Jones
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 1010882
TreeView+ depends on / blocked
 
Reported: 2013-09-23 09:01 UTC by Andrew Jones
Modified: 2014-06-18 03:38 UTC (History)
6 users (show)

Fixed In Version: qemu-kvm-1.5.3-9.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1010882 (view as bug list)
Environment:
Last Closed: 2014-06-13 11:22:00 UTC
Target Upstream Version:

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Description Andrew Jones 2013-09-23 09:01:19 UTC 
Backport 972fc544b6034 "kvm: warn if num cpus is greater than num recommended" from uq/master in order to help enforce the recommended max vcpu limit.
Comment 1 Miroslav Rezanina 2013-10-10 11:33:59 UTC 
Fix included in qemu-kvm-1.5.3-9.el7
Comment 3 huiqingding 2013-12-18 09:29:11 UTC 
Reproduce this bug using the following version:
qemu-kvm-1.5.3-8.el7.x86_64
kernel-3.10.0-63.el7.x86_64

Steps to Reproduce:

1. Start a guest with 255 vcpus
# /usr/libexec/qemu-kvm -M pc -cpu SandyBridge -enable-kvm -m 2048 -smp 255 -name rhel7 -uuid 6afa5f93-2d4f-420f-81c6-e5fdddbd1c83 -drive file=/home/RHEL-Server-7.0-64-virtio.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,serial=40c061dd-5d60-4fc5-865f-55db700407f0,werror=stop,rerror=stop,aio=threads -device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0  -vnc :1 -monitor stdio -spice port=5900,disable-ticketing  -qmp tcp:0:4445,server,nowait -netdev tap,id=hostnet0,ifname=guest13,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown,vhost=on -device virtio-net,netdev=hostnet0,mac=54:52:1b:35:3c:16,id=test

Actual results:
After step1, there is no warning information.
Comment 4 huiqingding 2013-12-18 09:32:50 UTC 
Verify this bug using the following version:
qemu-kvm-1.5.3-21.el7.x86_64
kernel-3.10.0-63.el7.x86_64

Steps to Reproduce:

1. Start a guest with 255 vcpus
# /usr/libexec/qemu-kvm -M pc -cpu SandyBridge -enable-kvm -m 2048 -smp 255 -name rhel7 -uuid 6afa5f93-2d4f-420f-81c6-e5fdddbd1c83 -drive file=/home/RHEL-Server-7.0-64-virtio.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,serial=40c061dd-5d60-4fc5-865f-55db700407f0,werror=stop,rerror=stop,aio=threads -device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0  -vnc :1 -monitor stdio -spice port=5900,disable-ticketing  -qmp tcp:0:4445,server,nowait -netdev tap,id=hostnet0,ifname=guest13,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown,vhost=on -device virtio-net,netdev=hostnet0,mac=54:52:1b:35:3c:16,id=test

Actual results:
After step1, there are the following warning information:
Warning: Number of SMP cpus requested (255) exceeds the recommended cpus supported by KVM (160)
Warning: Number of hotpluggable cpus requested (255) exceeds the recommended cpus supported by KVM (160)
QEMU 1.5.3 monitor - type 'help' for more information
(qemu)

Based on the above result, I think this bug is fixed.
Comment 6 Ludek Smid 2014-06-13 11:22:00 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

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