Re: [Xen-devel] pre-reservation of memory for domain creation

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

At 12:41 +0000 on 09 Feb (1265719265), Jan Beulich wrote:
> >OK; the early allocation, for a domain with no vcpus and no RAM, is a
> >constant 4 MiB, and just needs to be added to whatever overheads are
> >already being taken into account (domain and vcpu structs, VMCBs, &c).
> 
> The issue is that this used to be 1Mb. Hence the question whether
> in fact it needs to be 4Mb now (which it got increased to when max
> HVM vCPU-s got grown to 128).
> 
> The point here is that on one hand there's no clear picture how
> much memory is really needed before the full shadow allocation
> gets set up, and on the other hand Keir is recalling issues
> resulting from not growing the amount to 4Mb.

Righto.  The change from 1MB to 4MB is not the right fix for those
issues -- instead, Xend ought to set the shadow memory allocation before
it allocates vcpus.

Tim

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, XenServer Engineering
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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