RE: [Xen-ia64-devel][PATCH] optimization for windows

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Thanks for your comments.

>From: JÃrgen Groà [mailto:juergen.gross@xxxxxxxxxxxxxxxxxxx]
>Sent: 2007å4æ27æ 17:28
>To: Xu, Anthony
>Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-ia64-devel][PATCH] optimization for windows
>
>Xu, Anthony wrote:
>> This is optimization for windows 2003.
>>
>> Windows use region 4 and region 5 for identity mapping.
>>
>> I see ~3% improvement when running specjbb2005 on guest windows after
>> applying this patch.
>>
>
>Did I understand this correct?
>If Region 7 preferred page size is 8kB, Region 4 and 5 will be identity
>mapping, regardless of DomU type?

It is for HVM guest not for domU.

>
>This may work for windows (current version), but other DomUs might fail!
Currently, HVM only support linux and windows, so if region 7 preferred page 
size is 8K, it is windows.
And I had put the comment there " // bad hack":-)

>
>Wouldn't it be better to have some generic features like "region x identity
>mapping with attributes y" which can be set via DomU configuration file?
It is not convenient for user.
And user can't know this information, if we provide this interface to user.
User may be confused, and if user uses this configuration incorrectly, it will 
break guest.

Thanks,
Anthony


>
>Juergen
>
>--
>Juergen Gross                             Principal Developer
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