RE: [Xen-devel] 3D Mark differs a lot when testing on Native and xen machine

["Xia, Liangfu" <liangfu.xia@xxxxxxxxx>]

Thanks.
It seems to be the true root


Thanks
-----Original Message-----
From: Ian Pratt [mailto:Ian.Pratt@xxxxxxxxxxxxx] 
Sent: 2009年3月11日 19:37
To: Xia, Liangfu; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Ian Pratt
Subject: RE: [Xen-devel] 3D Mark differs a lot when testing on Native and xen 
machine

>          I confronted with an interesting problem. I have one machine
> with 2GB RAM. I did the following experiments;
> 
> 1)         When running vista based on xen such as domain vista, I
> assign it 1GB memory and 1GB memory left for domain0; it can get a 3D
> Mark score: 269;
> 
> 2)         After step 1, I plug 1GB memory and the physical memory of
> the machine is changed to 1GB; in the native mode of vista, it gets a
> 3D Mark score: 200;

Does your chipset support dual memory channels? If so, removing the DIMM may 
have halved your memory bandwidth.

Ian

 
> 3)         After step 2, I changed my machine's physical memory to 2GB,
> run 3D Mark again, it gets a 3D Mark score: 271;
> 
> 
> 
>          Now I am confused about this problem: why native system with
> 1GB memory gets a worse result comparing to virtual system with 1GB
> memory?
> 
>          Does the above domain vista use the memory of domain 0? Or it
> won't get nearly the same result as native system with 2GB physical
> memory.
> 
> 
> 
> Thanks

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