________________________________
From: Dor Laor [mailto:[EMAIL PROTECTED]
Sent: 2007年9月21日 5:09
To: Haydn Solomon
Cc: He, Qing; kvm-devel; Avi Kivity
Subject: Re: [kvm-devel] windows 2003 smp guest
Haydn Solomon wrote:
I have a question on guest smp performance. If I have a host with core 2 duo,
should a kvm guest perform better using -smp 2 as opposed to not using -smp 2?
Well, it depends:
In general Avi measured 40% performance increase for using a second cpu in the
guest. This was long time ago,
before the in-kernel-apic implementation. It might improve the gain of the
additional cpu.
On the other hand, for 32 bit windows, using ACPI HAL has pretty big overhead
at the moment. Since it is a must
for smp guest, it might be slower than running non-acpi single cpu VM.
My guess is that you better use -smp 2.
Dor.
On 9/18/07, Haydn Solomon <[EMAIL PROTECTED]> wrote:
I'm going to try the acpi multiprocessor HAL and see how that works. What kind
of performance do you get with it?
On 9/18/07, He, Qing < [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > wrote:
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] ] On Behalf Of Avi Kivity
>Sent: 2007年9月18日 22:06
>To: Haydn Solomon
>Cc: kvm-devel
>Subject: Re: [kvm-devel] windows 2003 smp guest
>
>Haydn Solomon wrote:
>> I am interested in installing smp windows 2003 server guest and have
>> some questions.
>>
>> 1. Is windows smp guest working and performing well at this point in kvm?
>
>It's working will with -no-kvm-irqchip. Not so sure without the switch,
>but we're improving things.
>
>I haven't tested performance very thoroughly. What's your workload?
It's also working well on my side if the option is not presented :-)
>
>> 2. If question 1 above is true, then what HAL should I choose during
>> installation and what other flags should I use when running it?
>>
>
>Good question. What HALs are available for Windows 2003 SMP?
I'm using ACPI multiprocessor HAL, don't know how MPS multiprocessor HAL works.
>
>--
>error compiling committee.c: too many arguments to function
>
>
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