RE: [Xen-devel] Test results on Unisys ES7000 32x 128gb usingxen-unstable (c/s 15470) - 2 old issues; 2 new issue

["Krysan, Susan" <KRYSANS@xxxxxxxxxx>]

Yes, the problem was happening on large memory guests, PV and VT, and I
only tried 64-bit guests with such a large size.

However, the server I was testing on recently had software installed in
dom0 which monitors the servers up time (heartbeat) and when the
heartbeat is lost, the software halts the server.  Large memory guests
take a long time to start and shut down, but during shut down, the host
becomes unresponsive.  With the heartbeat monitoring enabled, this
unresponsiveness was resulting in the software halting the server.  I
disabled this feature and the host no longer halts.

Do you have any ideas as to where we can look to determine why the
server seems to be starved for resources, and thus unable to respond to
the heartbeat, when a large virtual machine is shutting down?  Keep in
mind that we run with dom0_mem=512M because otherwise starting the large
VMs takes much longer.  

Thanks,
Sue Krysan
Linux Systems Group
Unisys Corporation
 
-----Original Message-----
From: Ian Pratt [mailto:Ian.Pratt@xxxxxxxxxxxx] 
Sent: Sunday, July 08, 2007 4:36 PM
To: Krysan, Susan; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: ian.pratt@xxxxxxxxxxxx
Subject: RE: [Xen-devel] Test results on Unisys ES7000 32x 128gb
usingxen-unstable (c/s 15470) - 2 old issues; 2 new issue

> Host:  Unisys ES7000/one, x86_64, 32 physical processors, 128 GB RAM
> 
> 2 OLD ISSUES:
> 
> Host halts upon shutdown of 126000mb domU and domVT
> 
> Testing includes running xm-test and also attempting to boot and run
> programs in the following domUs and domVTs (running domains #s 3
> through 9 simultaneously):
>  
> 1.       32-processor 64-bit SLES10 domU with 126gb (126000mb) memory
-
> run kernbench optimal load
> 
> 2.       32-processor 64-bit SLES10 domVT with 126gb (126000mb) memory
> - run kernbench optimal load
> 
> 
> Domain #1 and #2 - able to run kernbench in these domains, but host
> crashes when shut them down; serport does not provide a reason why.
> 
> Reducing the memory of these domains to 124000mb used to work, but
have
> tested 122000mb and 120000mb and host still halts. Still running tests
> to determine the largest size domain that works.

Are you saying that booting a single very large 64b guest either VT or
PV and then shutting it down will kill the host?

If you boot a debug build of xen, do you get any messages out the serial
port?

Thanks,
Ian



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