Re: [Xen-Users] System reboots after "Scrubbing free RAM" Xen 4.0.1 linux 2.6.37-rc3

[Joaquin Fernandez Piqueras <jfernandez@xxxxxxxxxxx>]

Al 25/11/10 00:16, En/na Marek Kaszycki ha escrit:
> Hi Everyone
>
> I have sorted out the initial issues I've had and decided to give Xen 
> another go.
> I'm trying to run Xen using kernel 2.6.37-rc3 (previous attempt with 
> rc1 failed, and when I gave it a second go, rc3 was already out).
> As previously, 2.6.37-rc3 boots fine natively. 2.6.32 boots natively 
> and under Xen as dom0, but I have reservations against running 2.6.32, 
> please bear with me.
> Booting 2.6.37-rc3 under Xen (4.0.1-1, squeeze) causes a reboot right 
> after "Scrubbing free RAM" appears -- I believe some tables appear 
> just to blink on the screen right afterwards, but I am unable to 
> confirm just what exactly is there -- I don't have a serial console 
> attached -- so I am unable to capture the output from Xen or dom0.
> I am at a loss as to what causes this. I have compiled the kernel 
> myself, following the advice on 
> http://wiki.xen.org/xenwiki/XenParavirtOps
> Since there are additional lines after the error message, I believe 
> the hypervisor completes its init and the reboot happens just when the 
> hypervisor wants to boot dom0.
> I have checked the threads:
> http://lists.xensource.com/archives/html/xen-users/2010-11/msg00420.html
> http://lists.xensource.com/archives/html/xen-devel/2010-04/msg01227.html
> My system has just 8 GB of RAM and just one CPU. Following the advice, 
> I have added 'noreboot' to Xen entry in grub.cfg, but even though Xen 
> doesn't reboot the system now, it's worse because right after 
> "Scrubbing free RAM", the screen goes blank, no cursor or anything, 
> and just stays this way.
> I have uploaded the grub.cfg and kernel .config to the following 
> locations:
> http://www.kaszycki.pl/xen/grub.cfg
> http://www.kaszycki.pl/xen/kconfig
>
> Thanks in advance for all your help.
Hi,

I have the same issue with a server with 32GB of RAM. In my case the 
system reboots after "Scrubbing free RAM" when the dom0_mem parameter is 
16GB or less. I don't know if my problem is related , but I 
workarrounded it setting dom0_mem=17GB and when the system boots I 
decrease this value to 2GB with the "xm mem-set" command.
It's not the best solution, but really I don't know how to get the 
"dom0_mem=2GB" work.
Quimi


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