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

["Hao, Xudong" <xudong.hao@xxxxxxxxx>]

> -----Original Message-----
> From: Tim Deegan [mailto:tim@xxxxxxx]
> Sent: Thursday, June 28, 2012 6:30 PM
> To: Hao, Xudong
> Cc: keir@xxxxxxx; Shan, Haitao; JBeulich@xxxxxxxx; Zhang, Xiantao;
> xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH v2 0/4] xen: enable EPT A/D bit feature
> 
> 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?
> 

Ok, I'll test it.

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

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