From: Piavlo <piavka@cs.bgu.ac.il>
To: kvm@vger.kernel.org
Subject: which -cpu to use
Date: Thu, 26 Feb 2009 00:48:06 +0000 [thread overview]
Message-ID: <49A5E6C6.5030907@cs.bgu.ac.il> (raw)
Hi,
I'm new to KVM and have some questions regarding kvm cpu emulation,
hope you can answer them.
I have a kvm node with Dual-Core AMD Opteron(tm) Processor 2218 processors.
1)I was wondering choosing what cpu emulation for VM would give best
performance?
I get the following options
# kvm -cpu ?
x86 qemu64
x86 phenom
x86 core2duo
x86 qemu32
x86 coreduo
x86 486
x86 pentium
x86 pentium2
x86 pentium3
x86 athlon
x86 n270
#
I was thinking one of qemu64/phenom/athlon .
Does It matter what 64bit cpu emulation i choose?
What would be chosen if I omit the -cpu option?
2) I want to optimize/recompile a gentoo VM system packages for the
chosen cpu - if that matters.
Does rebuilding the VM packages to fine tuned for the emulated cpu give
any advantages?
3) Do I have to boot a VM kernel with guest viritio drivers, to get a
not emulated real cpu access - like I have in Xen?
Thanks a lot.
Alex
next reply other threads:[~2009-02-25 23:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-26 0:48 Piavlo [this message]
2009-02-26 9:31 ` which -cpu to use Alexander Graf
2009-02-26 11:07 ` Piavlo
2009-02-26 12:07 ` Alexander Graf
2009-02-26 12:16 ` Javier Guerra Giraldez
2009-02-26 12:57 ` Piavlo
2009-02-26 15:22 ` Javier Guerra
2009-02-27 7:50 ` paolo pedaletti
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