Re: [Xen-devel] dom0 linux 3.6.0-rc4, crash due to ballooning althoug dom0_mem=X, max:X set

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Thursday, September 6, 2012, 12:57:46 PM, you wrote:

>> > About nine of them deal with dom0_mem=max ballooning up right, so if you
>> > ignore those:
>> 
>> > b9e0d95 xen: mark local pages as FOREIGN in the m2p_override
>> > d79d595 xen: Add selfballoning memory reservation tunable.
>> > f62805f xen: enter/exit lazy_mmu_mode around m2p_override calls
>> 
>> > Try reverting any of those.
>> 
>> Ah i missed your email since my hostingprovider was down :-(
>> But anyway done a git bisect in the mean time that leads to:
>> 
>> [f62805f1f30a40e354bd036b4cb799863a39be4b] xen: enter/exit lazy_mmu_mode 
>> around m2p_override calls

> OK. Hmm.that will take a bit of thinking to fix.
>> 
>> 
>> > And if nothing works there then we can try to revert the ones that
>> > deal with 'dom0_mem=max:XX'..
>> 
>> > I also need to be able to reproduce this. You said you can only reproduce 
>> > this
>> > on your Intel box - is this a fast Intel machine? It also looks like you 
>> > only
>> > have 2GB in the machine - and reserve 1GB to the dom0.
>> 
>> Machine is a quad core q9400 @ 2.66mhz, not very fast .. not very slow either

> That is a fast machine. I was thinking you had a Core2 Solo or a Pentium IV 
> Prescott.

>> 
>> > If you manually (so don't start the guest), balloon down - say to 512MB 
>> > and then launch
>> > a guest do you see this problem?
>> 
>> 
>> Should i use
>> 
>> xl  mem-max domain-id mem
>> 
>> or
>> 
>> xl  mem-set domain-id mem

> The later.

Ok tested that as well:
   - After "xl  mem-set 0 768M", xentop reports the new mem values (free and 
for dom0) correctly, nothing else happens.
   - After a small wait, i tried to start a guest and it crashes dom0 with the 
ballooning as before.

>> 
>> for that ?
>> 
>> 
>> Perhaps a silly question, but why is it ballooning anyway ?
>> I have set dom0's memory and there is enough left to create the domain ... 
>> or at least there should be ...

> There was a bug in xl that would autoballoon. You can turn it off using some 
> xl.conf file.

>> 
>> --
>> Sander



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