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RE: [Xen-devel] xm mem-set causes kernel panic

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] xm mem-set causes kernel panic
From: "Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>
Date: Thu, 4 May 2006 11:49:37 -0400
Cc: "Carb, Brian A" <Brian.Carb@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Krysan, Susan" <KRYSANS@xxxxxxxxxx>, "Subrahmanian, Raj" <raj.subrahmanian@xxxxxxxxxx>, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx>
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Thread-index: AcZvYg476S3yrxWSSw6ajWdR4F1RogAL/XXQ
Thread-topic: [Xen-devel] xm mem-set causes kernel panic
> I don't think this behaviour is surprising. The kernel is probably
> taking about 1% of memory to track memory usage. So trying to balloon
> down to 1-2% of your initial memory reservation is rather harsh.

I agree.

> The 'fix' here is to stop users being able to shoot their feet off, by
> setting a lower bound on ballooning that is related to the initial
> memory size of the guest, and/or quiesce the balloon driver when
> low-memory and out-of-memory code paths are executed in the guest.

We will look into this and send in a patch.


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