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[Xen-users] maximum domain memory

To: Xen Users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] maximum domain memory
From: Igor Serebryany <igor47@xxxxxxxxxxx>
Date: Mon, 2 Aug 2010 21:25:34 -0500
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        I'm trying to figure out what the maximum amount of memory that can
        be assigned to a domain is. I created a domain with a ludicrous
        amount of memory and then tried to start it up, and got the
        following error:

        Error: I need 9999360 KiB, but dom0_min_mem is 200704 and shrinking
        to 200704 KiB would leave only 7001948 KiB free.

        I am wondering: where did the value 7001948 come from. Here is the
        output of free on Dom-0:

             total       used       free     shared    buffers     cached
Mem:       1959936    1722756     237180          0      20680    1306968
-/+ buffers/cache:     395108    1564828
Swap:      4200988        744    4200244

        The box has 2 GB (usually 2065264 kB) of ram (so 105328 kB already
        seems to be missing). However, if I add up total memory + total swap
        I still get only 6266252 kB free, and this is not even counting what
        Xen has already reserved...


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