performance: 0.899
device: 0.571
graphic: 0.532
files: 0.475
vnc: 0.406
permissions: 0.314
network: 0.262
boot: 0.243
PID: 0.241
socket: 0.234
semantic: 0.189
other: 0.147
debug: 0.114
KVM: 0.037

QEMU does not support Westmere (Intel Xeon) CPU model

Setting the CPU model to Westmere (Intel Xeon server CPU) is not possible.

libvirt uses 'core2duo' as fallback:
https://bugzilla.redhat.com/show_bug.cgi?id=708927


$ qemu -cpu ?
x86           [n270]
x86         [athlon]
x86       [pentium3]
x86       [pentium2]
x86        [pentium]
x86            [486]
x86        [coreduo]
x86          [kvm32]
x86         [qemu32]
x86          [kvm64]
x86       [core2duo]
x86         [phenom]
x86         [qemu64]

$ qemu --version
QEMU emulator version 1.0 (Debian 1.0+dfsg-3), Copyright (c) 2003-2008 Fabrice Bellard

An application test with high cpu load gives the timing statistics give:
                                              

                                           bare metal                       virtual                           percent

X4560 cpu                            50m28s                          54m0s                          107%

X5690 (westermere)         29m20s                          38m0s                         134%



Westmere seems to be available in the latest version of QEMU:
$ qemu-system-x86_64 -cpu ? | grep Westmere
x86         Westmere  Westmere E56xx/L56xx/X56xx (Nehalem-C)
==> Setting status to "Fix released" now.