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xen-devel
Re: [Xen-devel] xm mem-set causes kernel panic
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To: |
"Krysan, Susan" <KRYSANS@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] xm mem-set causes kernel panic |
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From: |
Andrew Theurer <habanero@xxxxxxxxxx> |
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Date: |
Wed, 03 May 2006 16:29:08 -0500 |
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Cc: |
Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>, "Subrahmanian, Raj" <raj.subrahmanian@xxxxxxxxxx>, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx>, "Carb, Brian A" <Brian.Carb@xxxxxxxxxx> |
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Krysan, Susan wrote:
We did run using unstable. We installed sles10 beta11 but we pulled and built
xen-unstable changeset 9903 from xensource repository. We have not tried with
PAE hypervisor. It is not our focus. How desperately would you need us to try
PAE?
I have done this on 32GB x86_64 as well and have pretty much the same
problem. I think the problem is that the static memory allocations in
the kernel for things like mem_map, page_struct etc, are quite large for
32GB, and do not shrink (or do they?) when balooning to 512 MB. This
leaves almost no usable memory when balooning down, and you get OOM. If
you know you don't need 32G for dom0, I would try setting dom0_mem to
something much lower, like 1GB.
-Andrew Theurer
Thanks,
Sue Krysan
Linux Systems Group
Unisys Corporation
-----Original Message-----
From: Ian Pratt [mailto:m+Ian.Pratt@xxxxxxxxxxxx]
Sent: Wednesday, May 03, 2006 4:19 PM
To: Krysan, Susan; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Subrahmanian, Raj; Vessey, Bruce A; Puthiyaparambil, Aravindh; Carb,
Brian A; ian.pratt@xxxxxxxxxxxx
Subject: RE: [Xen-devel] xm mem-set causes kernel panic
When I boot the ES7000 with 32 GB of RAM, dom0 is allocated
almost all of it. I issued an xm mem-set 0 512 command to
decrease dom0's memory to 512 MB. Using xentop, I see the
amount of memory allocated to dom0 slowly decrease. The
kernel panic occurs when dom0's memory is around 1 GB. The
serial console output is attached. Using SLES10 Beta 11
upgraded to xen changeset 9903.
Can you repro this on -unstable? What about with a PAE hypervisor?
Thanks,
Ian
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