Re: [Xen-devel] [RFC] new totalmem= boot parameter

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 19/07/2010 18:56, "Sarina Canelake" <sarina.canelake@xxxxxxxxxx> wrote:

> We have a need for ensuring the total RAM available to [Xen / the kernel] at
> boot is X MB because there are situations in which you wish to limit the
> amount of RAM available to a box. The existing mem= option doesn't work
> because it limits the maximum physical address, NOT the amount of available
> RAM. Many, if not all, systems contain a substantial memory hole below 4 Gb,
> typically a 0.5 or 1 Gb hole from 3-4 Gb. Thus, on a system with 6 Gb of RAM,
> requesting mem=4096M will yield a box with maximum physical address in the 4
> Gb neighborhood but perhaps only 3 or 3.5 actual gigs of RAM available.

It doesn't sound *very* useful. But then neither is mem= really. We can add
something like this if you really need it. So what's the motivation?

 -- Keir



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