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RE: [Xen-devel] GPLPV memory ballooning and x32

  • To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Pasi Kärkkäinen <pasik@xxxxxx>
  • From: Aravindh Puthiyaparambil <aravindh@xxxxxxxxxx>
  • Date: Tue, 25 May 2010 14:27:32 -0700
  • Accept-language: en-US
  • Acceptlanguage: en-US
  • Cc: James Harper <james.harper@xxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Tue, 25 May 2010 14:28:36 -0700
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  • Thread-topic: [Xen-devel] GPLPV memory ballooning and x32

> > Any idea why this is occurring?
> Perhaps a bug in populate-on-demand, which I guess is what gets enabled
> when
> you specify maxmem parameter for an HVM domain. It gets allocated its
> basic
> memory parameter initially, and extra memory gets allocated when the
> guest first writes to it, up to maxmem limit. Or that's the intent
> anyway.
> This is not a regression from 3.1 presumably (3.1 does not implement
> populate-on-demand at all)?

No, this is not a regression from 3.1. With 3.1 the domHVM would come up but 
you would only be able to balloon up and down between N and what was specified 
in the memory option. The maxmem option had no effect. However, as you pointed 
out ballooning was only kind of working with 3.1.

Is there a work around for this issue in 3.4.2?


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