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Bug 823839 - win2kr2 guest cpu usage always keep 41% after boot guest with -smp 160 in AMD host
Summary: win2kr2 guest cpu usage always keep 41% after boot guest with -smp 160 in AM...
Keywords:
Status: CLOSED DUPLICATE of bug 820112
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm
Version: 6.3
Hardware: x86_64
OS: Windows
medium
medium
Target Milestone: rc
: ---
Assignee: Gleb Natapov
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-05-22 09:47 UTC by FuXiangChun
Modified: 2012-06-09 17:13 UTC (History)
18 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-06-09 17:13:37 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
screenshot (25.55 KB, image/png)
2012-05-22 09:49 UTC, FuXiangChun 		no flags Details
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Description FuXiangChun 2012-05-22 09:47:02 UTC 
Description of problem:
boot a win2kr2 with "-smp 160,sockets=40,cores=4,threads=1" and check 'task manager-->performance', find cpu usage always keep 41%.  screenshot is in attachment.  There isn't this issue in Intel host. 



notes: I don't run any additional application programme in guest.

Version-Release number of selected component (if applicable):
# uname -r
2.6.32-272.el6.x86_64
#rpm -qa|grep qemu
qemu-kvm-0.12.1.2-2.294.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1./usr/libexec/qemu-kvm -M rhel6.3.0 -cpu Opteron_G4 -monitor stdio -enable-kvm -m 512G -smp 160,sockets=40,cores=4,threads=1 -name rhel6 -uuid 745fe449-aac8-29f1-0c2d-5042a707263b -boot c -drive file=/home/windows-image/win2k8-R2-nic-0505.raw,if=none,id=drive-ide0-0-0,format=raw,cache=none,aio=threads -device virtio-blk-pci,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1,scsi=off -netdev tap,id=hostnet1 -device virtio-net-pci,netdev=hostnet1,id=net1,mac=86:12:50:a4:35:75 -spice disable-ticketing,port=5913 -device sga -chardev socket,id=serial0,path=/var/test4,server,nowait -device isa-serial,chardev=serial0

2.check 'cpu usage' from 'task manager-->performance tab'
3.
  
Actual results:
cpu usage keep 41%

Expected results:
cpu usage is about 1%

Additional info:
AMD 6172 host: cores number:48, memory size:512G
Comment 1 FuXiangChun 2012-05-22 09:49:22 UTC 
Created attachment 585979 [details]
screenshot
Comment 2 Miya Chen 2012-05-22 11:18:24 UTC 
Fu, how about the test result with our 160core Intel big machine?
Comment 3 FuXiangChun 2012-05-23 01:12:43 UTC 
(In reply to comment #2)
> Fu, how about the test result with our 160core Intel big machine?

Miya,
    I tested this issue in Intel e7450(cores 96) host, There isn't this issue. It occurs only in AMD host.
Comment 5 Gleb Natapov 2012-06-09 17:13:37 UTC 
This is DUP of BZ#820112. Also we do not support guests with number of vcpus greater than number of host cpus.

*** This bug has been marked as a duplicate of bug 820112 ***
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