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)

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Fabio Fantoni [mailto:fabio.fantoni@xxxxxxx]
> Sent: 11 May 2015 11:27
> To: Paul Durrant; Ian Campbell; Wei Liu
> Cc: 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)
> 
> 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?
> 

Might be helpful to know the merits of each independently. I plan a patch to 
turn them both on though.

  Paul

> Thanks for any reply and sorry for my bad english.
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