Re: [Xen-devel] [PATCH v2 0/4] xen: enable EPT A/D bit feature

[Tim Deegan <tim@xxxxxxx>]

At 05:31 +0000 on 26 Jun (1340688686), Hao, Xudong wrote:
> > - Have you measured what difference this makes?  I take it it improves
> >   performance during live migration but it would be good to know how much
> >   before taking on extra code.
> 
> We did live migration performance testing with patches, it's
> embarrassed to say but the result show there is no performance gain
> and no performance loss indeed.

Ah. 

But maybe they have some performance advantage for guests with
graphics-heavy workloads (by making the VRAM tracking faster)?
Could you test that to see if that's the case?

If it's not, I think you'll understand if we don't take these patches.

Cheers,

Tim.

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