[ kvm-Bugs-2886941 ] Extreme slow down using "-cpu host"

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Bugs item #2886941, was opened at 2009-10-27 08:26
Message generated for change (Tracker Item Submitted) made by nwxi
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2886941&group_id=180599

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Category: qemu
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: nwxi (nwxi)
Assigned to: Nobody/Anonymous (nobody)
Summary: Extreme slow down using "-cpu host"

Initial Comment:
Hi!

I've currently experienced a massive slowdown when using flag "-cpu host" on an AMD Phenom 905e with qemu-kvm 0.11.0 and kernel 2.6.31.3 x86_64. This affects network (tested e1000 and virtio) and i/o performance (virtio). Further there are dozens of log messages from kvm module complaining about:

 cpu0/1 unhandled rdmsr: 0xc0010055

Both, the slowdown and the rdmsr-message do not happen when using qemu64 as cpu, but also occur when using -cpu phenom. Thank you for your comments!

regards, Michael

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2886941&group_id=180599
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