Re: [PATCH 2/2] Add MSR Bitmap support in VMX

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

ron minnich wrote:
> On 8/2/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>   
>> Li, Xin B wrote:
>>     
>>>> Did you see any performance improvements out of this?
>>>>
>>>>         
>>> Acturally we don't expect any obviously performance because MSR accesses
>>> are not frequent.
>>>
>>>       
>> Well, why do this then?
>>     
>
> ah, see, you asked the question I was going to ask. OK, this can be
> faster; but, are you sure you really care?
>
>   

Looking at the Linux context switch code, it can bang on MSR_FS_BASE and 
MSR_KERNEL_GS_BASE. A high context switch rate between threads (which 
use %gs or %fs) can show an improvement with this.  Things like kbuild 
probably won't as they use single threaded processes.

-- 
error compiling committee.c: too many arguments to function


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