Re: [Xen-devel] [win-pv-devel] Question about windows domU long boot time in xen and help for update libxl virtio patch (for a test)

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 11/05/2015 11:55, Paul Durrant ha scritto:
> > -----Original Message-----
> > From: Ian Campbell [mailto:ian.campbell@xxxxxxxxxx]
> > Sent: 11 May 2015 09:42
> > To: Wei Liu
> > Cc: Paul Durrant; Fabio Fantoni; xen-devel; win-pv-
> > devel@xxxxxxxxxxxxxxxxxxxx; Anthony Perard; Stefano Stabellini
> > Subject: Re: [win-pv-devel] Question about windows domU long boot time in
> > xen and help for update libxl virtio patch (for a test)
> >
> > On Sat, 2015-05-09 at 14:28 +0100, Wei Liu wrote:
> > > On Fri, May 08, 2015 at 05:47:25PM +0100, Paul Durrant wrote:
> > > > I'm using the seabios image from the Xen build. Turns out that it's
> > > built with CONFIG_ATA_DMA off (because that's not set when you run
> > > make defconfig). Turning that on manually in the config and rebuilding
> > > makes things a *lot* faster :-)
> > > Maybe we should turn that on in our build?
> > Right now we just consume the upstream defconfig without any
> > modifications, so my preference would be to try and get them to enable
> > ATA_DMA by default (i.e. by sending a patch).
> >
> > If they don't want to do this for some reason (and those reasons don't
> > apply to us) then we should consider tweaking the config locally.
> >
> > NB many distros want to ship only a single image, so getting this turned
> > on globally would be a better approach.
> Agreed. I'll see if I can formulate a patch sometime this week.
>
>    Paul
>
> > Ian.
I tested now rebuiling debian seabios I use enabling ATA_DMA and also 
ATA_PIO32 I saw disabled by default and FWIK should affect performance 
and now hvm boot time was decreased, thanks!
About ATA_PIO32 what do you think? I not tried with it still disabled 
and only ATA_DMA for see difference, I must test also this case?
Thanks for any reply and sorry for my bad english.

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