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

On Wed, Jun 22, 2011 at 04:53:40PM +0100, Anthony Wright wrote:
> On 22/06/2011 15:39, Konrad Rzeszutek Wilk wrote:
> > On Wed, Jun 22, 2011 at 03:22:30PM +0100, Anthony Wright wrote:
> >> 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
> > dmesg | grep Memory: ?
> Ok, I'm being really thick here, but I can't get the Memory: lines to be
> output by the kernel. It looks like I can't get any KERN_INFO or
> KERN_DEBUG lines to be output no matter what I do to log level. I'm not
> much of a kernel hacker, but is there some debug code that I need to
> enable to get these messages? I've wandered through google, and the
> kernel code but I can't find anything obvious.

'debug loglevel=10' ?

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