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Re: [Xen-devel] 5x dom0 memory increase from Xen/Linux 3.4/2.6.18 to 4.1

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] 5x dom0 memory increase from Xen/Linux 3.4/2.6.18 to 4.1/3.0.0
From: Anthony Wright <anthony@xxxxxxxxxxxxxxx>
Date: Wed, 22 Jun 2011 15:22:30 +0100
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On 22/06/2011 14:32, Konrad Rzeszutek Wilk wrote:
> On Wed, Jun 22, 2011 at 02:15:35PM +0100, Anthony Wright wrote:
>> Maybe I'm misreading the output, but I couldn't see any numbers that
>> look like memory being assigned. I've attached the dmesg output. Do I
>> need to enable a CONFIG variable to get the output I need or am I
>> missing something.
> The memblock=debug should give you some idea of what is Reserved. The
> Reserved includes memory that is allocated by boot-time services (P2M,
> pagetables, NUMA) and by real reservations (for example ACPI space).
> Using the 'memblock=debug' can give you an idea of what services are
> reserving the most. Then we can narrow down who or what is eating the gobs
> of memory.
> see the 'Memory: ".. numbers. Also you might want to eliminate
> the balloon usage space algother by doing two things:
> Xen command line: dom0_mem=max:512MB
> Linux command line: mem=512MB
> That will effectivly remove any balloon space (so your Dom0 will _never_
> grow up).
The problem is I can't see any lines in the kernel dmesg output
(attached to previous email) that start "Memory: ", or anything else
that looks hopeful. Is there anything else I should add to the command
line, is there a kernel CONFIG option I should turn on or am I missing
something else?



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