Re: [gentoo-user] Recommendation for CPU type in QEMU?

[Marc Joliet]

Am Wed, 31 Jul 2013 06:11:24 -0400
schrieb "Walter Dnes" <waltdnes@××××××××.org>:

>   I'm looking at setting up 32-bit WINE to run a 32-bit Windows app.
> Since I'm on a pure 64-bit (no multi-lib) machine, that doesn't exactly
> work, which is why I'm looking at QEMU.  I need to run WINE in 32 bit
> mode, on a 32-bit install in a VM.  Is a 64-bit virtual cpu type
> recommended anyways?  Are the "qemu" and "kvm" cpu types faster/slower?
> And what would they be listed as in the kernel .config?
>
>   I'm not familiar with all the weird codenames for Intel's chips.
> What's the hierarchy between Nehalem/Westmere/SandyBridge/Haswell ?
> Here's the list of available types...
>
> [i660][waltdnes][~/qemu] sudo /usr/bin/qemu-kvm -cpu help
> x86           qemu64  QEMU Virtual CPU version 1.4.2
> x86           phenom  AMD Phenom(tm) 9550 Quad-Core Processor
> x86         core2duo  Intel(R) Core(TM)2 Duo CPU     T7700  @ 2.40GHz
> x86            kvm64  Common KVM processor
> x86           qemu32  QEMU Virtual CPU version 1.4.2
> x86            kvm32  Common 32-bit KVM processor
> x86          coreduo  Genuine Intel(R) CPU           T2600  @ 2.16GHz
> x86              486
> x86          pentium
> x86         pentium2
> x86         pentium3
> x86           athlon  QEMU Virtual CPU version 1.4.2
> x86             n270  Intel(R) Atom(TM) CPU N270   @ 1.60GHz
> x86           Conroe  Intel Celeron_4x0 (Conroe/Merom Class Core 2)
> x86           Penryn  Intel Core 2 Duo P9xxx (Penryn Class Core 2)
> x86          Nehalem  Intel Core i7 9xx (Nehalem Class Core i7)
> x86         Westmere  Westmere E56xx/L56xx/X56xx (Nehalem-C)
> x86      SandyBridge  Intel Xeon E312xx (Sandy Bridge)
> x86          Haswell  Intel Core Processor (Haswell)
> x86       Opteron_G1  AMD Opteron 240 (Gen 1 Class Opteron)
> x86       Opteron_G2  AMD Opteron 22xx (Gen 2 Class Opteron)
> x86       Opteron_G3  AMD Opteron 23xx (Gen 3 Class Opteron)
> x86       Opteron_G4  AMD Opteron 62xx class CPU
> x86       Opteron_G5  AMD Opteron 63xx class CPU
>

There's also "-cpu host", which simply passes your CPU through to the guest.
That's what I use for my 32 bit WinXP VM. You can use it if you don't mind not
being able to migrate your guest, but it sounds to me like you're doing this on
a desktop machine, so I suspect guest migration doesn't matter to you.

-- 
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup