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Re: [Xen-devel] Crash on boot with 2.6.37-rc8-git3

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] Crash on boot with 2.6.37-rc8-git3
From: M A Young <m.a.young@xxxxxxxxxxxx>
Date: Sun, 16 Jan 2011 20:48:23 +0000 (GMT)
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On Mon, 10 Jan 2011, Konrad Rzeszutek Wilk wrote:

Your E820 looks as so:
BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
BIOS-e820: 0000000000100000 - 00000000df66d800 (usable)
BIOS-e820: 00000000df66d800 - 00000000e0000000 (reserved)
BIOS-e820: 00000000f8000000 - 00000000fc000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
BIOS-e820: 00000000fed18000 - 00000000fed1c000 (reserved)
BIOS-e820: 00000000fed20000 - 00000000fed90000 (reserved)
BIOS-e820: 00000000feda0000 - 00000000feda6000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
BIOS-e820: 00000000ffe00000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000000120000000 (usable)

Which looks completly normal.. I am really at loss here.

I have looked at this again and I am worried by the last section, which is a chunk from 4GB to 4.5GB. The problem is that I only have 4GB. My tests show that dom0_mem=max:3574MB boots, dom0_mem=max:3575MB doesn't. The first two "usable" chunks add up to a few KB over 3574MB so the problems come when it tries to use the final "usable" chunk which I interpret as being beyond the memory I have.

3574MB is a bit less than 3.5GB so I would guess that the final chunk is trying to make up the memory to 4GB. There are also gaps in these memory pieces which add up to about 445MB. Hence I think there are some issues with the memory allocation mechanism.

        Michael Young

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