Re: [Xen-devel] vram_dirty vs. shadow paging dirty tracking

["Zhai, Edwin" <edwin.zhai@xxxxxxxxx>]

On Tue, Mar 13, 2007 at 02:32:56PM -0500, Anthony Liguori wrote:
> When thinking about multithreading the device model, it occurred to me 
> that it's a little odd that we're doing a memcmp to determine which 
> portions of the VRAM has changed.  Couldn't we just use dirty page 

we made this code to improve the user vnc responsiveness long before.
now QEMU has new vnc implementation to resolve this issue and this code 
introduce perf drop for guest of linux with X or windows.

so i'd like to send a patch to revert it and make a proper solution in future.

thanks,

> tracking in the shadow paging code?  That should significantly lower the 
> overhead of this plus I believe the infrastructure is already mostly 
> there in the shadow2 code.
> 
> Is this a sane idea?
> 
> Regards,
> 
> Anthony Liguori
> 
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-- 
best rgds,
edwin

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