Re: [Xen-devel] auto-ballooning crashing Dom0?

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Andre Przywara writes ("auto-ballooning crashing Dom0?"):
> during some experiments with many guests I get crashing Dom0s because of 
> too less memory. Actually the OOM killer goes 'round and kills random 
> things, preferably qemu-dm's ;-)
> The box in question has 128GB of memory, I start with dom0_mem=8192M (or 
> 16384M, doesn't matter). I also used "dom0_mem=8192M,min:1536M", but 
> that didn't make any difference. Xen is c/s 25688.

I have seen similar effects occasionally but have usually been to busy
in the middle of something else to do anything about it.  The
autoballooning arrangements aren't very good TBH and we are intending
to improve things in 4.3.

> Either we change this to something higher (768 MB worked for me) or we 
> make this a config option in xl.conf (like it was in xend-config.sxp)

Certainly it should be a config option.

> Another option would be to make it dynamic, by looking at the actual 
> memory currently used in Dom0 and don't balloon down to 110% or so of it.

That would be a possibility.

> In any case we should do something still for Xen 4.2, as I guess people 
> dislike crashing Dom0, tearing down all the domains with it...

Yes.

Ian.

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