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Re: [Xen-users] Ballooning on SLES11SP1

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Subject: Re: [Xen-users] Ballooning on SLES11SP1
From: Werner Flamme <werner.flamme@xxxxxx>
Date: Fri, 06 Aug 2010 07:55:03 +0200
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James Pifer [05.08.2010 18:50]:
> We have some test servers running SLES11SP1 and we've updated to the
> latest kernel from Novell:
> Since running the updates on these servers our xen ballooning parameters
> are not working. Because of memory problems in the past we set dom0 to
> 2048 meg of ram in grub and set the following parameters
> in /etc/xen/xend-config.sxp:
> (dom0-min-mem 2048)
> (enable-dom0-ballooning no)
> Looks like this kernel is ignoring those parameters because I had to
> turn ballooning back on before we could start any VMs. 
> I was going to open a ticket with Novell, but thought I'd ask if anyone
> has seen this? 
> Maybe disabling ballooning is not the way to go anymore, anyone have
> opinions on that? We used to run out of memory a lot, even though there
> was plenty free. Disabling ballooning seemed to make things more stable
> at the time. 
> Any suggestions are appreciated. 

I don't know if you're interested in the opinion that SAP has. They
recommend to not use more than 1 gig of RAM in dom0 (since there should
be no services running in dom0, you better create a new domU for those)
and to disable ballooning, since this may cause errors. Besides, the SAP
software claims its memory directly when starting and so there is no
need for further ballooning for their domUs ;-)

I use dom0_mem=1024M in the kernel line in /boot/grub/menu.lst and I
added it in /etc/sysconfig/bootloader to the XEN_KERNEL_APPEND variable,
so every kernel update will still use this value.

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