From: Farkas Levente <lfarkas-lWVWdrzSO4GHXe+LvDLADg@public.gmane.org>
To: dor.laor-atKUWr5tajBWk0Htik3J/w@public.gmane.org
Cc: kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
"He, Qing" <qing.he-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Subject: Re: windows 2003 smp guest
Date: Thu, 20 Sep 2007 23:36:53 +0200 [thread overview]
Message-ID: <46F2E7F5.7080105@bppiac.hu> (raw)
In-Reply-To: <46F2E17E.20607-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Dor Laor wrote:
> 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.
can you tell me what does the HAL means here? and what's kind of HAL
exists what are the advantage/disadvantages them. how can i
change/configure this?
--
Levente "Si vis pacem para bellum!"
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next prev parent reply other threads:[~2007-09-20 21:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-18 14:01 windows 2003 smp guest Haydn Solomon
[not found] ` <b75785ba0709180701h23ef400ey748b86cfbdf43e1a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-18 14:05 ` Avi Kivity
[not found] ` <46EFDB2C.30601-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-18 14:34 ` Haydn Solomon
[not found] ` <b75785ba0709180734s59ef677agac7c6a4e99753b1e-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-18 14:42 ` Avi Kivity
[not found] ` <46EFE3D3.2000303-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-18 14:56 ` Haydn Solomon
[not found] ` <b75785ba0709180756v7e4318bdle72b9dbb879400aa-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-18 15:51 ` Haydn Solomon
[not found] ` <b75785ba0709180851l7c1c6c84uded5fc1fdebbd257-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-18 15:52 ` Avi Kivity
[not found] ` <46EFF43B.8030500-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-18 15:59 ` Haydn Solomon
2007-09-19 1:27 ` He, Qing
[not found] ` <37E52D09333DE2469A03574C88DBF40FA9C23E-wq7ZOvIWXbM/UvCtAeCM4rfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-09-19 2:17 ` Haydn Solomon
[not found] ` <b75785ba0709181917u7308717dy8085871e2a831718-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-20 17:05 ` Haydn Solomon
[not found] ` <b75785ba0709201005n6958299ah241fa4c8b4b1280d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-20 21:09 ` Dor Laor
[not found] ` <46F2E17E.20607-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-09-20 21:36 ` Farkas Levente [this message]
[not found] ` <46F2E7F5.7080105-lWVWdrzSO4GHXe+LvDLADg@public.gmane.org>
2007-09-20 21:46 ` Luca
[not found] ` <68676e00709201446x76c17d46ofebf4c6702e17b7c-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-09-20 21:59 ` Farkas Levente
[not found] ` <46F2ED31.4050709-lWVWdrzSO4GHXe+LvDLADg@public.gmane.org>
2007-09-20 22:37 ` Gildas
2007-09-21 2:07 ` He, Qing
2007-09-21 2:16 ` He, Qing
[not found] ` <37E52D09333DE2469A03574C88DBF40FA9C245-wq7ZOvIWXbM/UvCtAeCM4rfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-09-23 16:27 ` Haydn Solomon
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