Re: [Xen-devel] XEN 4.0 + 2.6.31.13 pvops kernel : system crashes on starting 155th domU

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Apr 27, 2010 at 10:14:40AM -0700, Yuvraj Agarwal wrote:
> I am not using grub2; using grub-legacy instead. 
> 
> Also, once the dom0 boots up I do have to set the dom0 mem to:
> 
> (1) xm mem-set 0 12000   (otherwise when starting up a lot of domU it
> would run out of memory) 
> and 
> (2) echo 1548576 > /proc/sys/fs/aio-max-nr 
> 

You might want to use dom0_mem=<X>M option for xen.gz instead.

See:
http://wiki.xensource.com/xenwiki/XenBestPractices

-- Pasi

> 
> My /boot/grub/menu.lst  (pasted relevant lines) 
> **************************************************
> 
> root@MESL-BlackBox:/usr/src# cat /boot/grub/menu.lst                 
> # menu.lst - See: grub(8), info grub, update-grub(8)
> #            grub-install(8), grub-floppy(8),
> #            grub-md5-crypt, /usr/share/doc/grub
> #            and /usr/share/doc/grub-doc/.
> 
> ## default num
> # Set the default entry to the entry number NUM. Numbering starts from 0,
> and
> # the entry number 0 is the default if the command is not used.
> #
> # You can specify 'saved' instead of a number. In this case, the default
> entry
> # is the entry saved with the command 'savedefault'.
> # WARNING: If you are using dmraid do not use 'savedefault' or your
> # array will desync and will not let you boot your system.
> default         0
> 
> ## timeout sec
> # Set a timeout, in SEC seconds, before automatically booting the default
> entry
> # (normally the first entry defined).
> timeout         20
> 
> ### BEGIN AUTOMAGIC KERNELS LIST
> ## lines between the AUTOMAGIC KERNELS LIST markers will be modified
> ## by the debian update-grub script except for the default options below
> 
> ## DO NOT UNCOMMENT THEM, Just edit them to your needs
> 
> ## ## Start Default Options ##
> ## default kernel options
> ## default kernel options for automagic boot options
> ## If you want special options for specific kernels use kopt_x_y_z
> ## where x.y.z is kernel version. Minor versions can be omitted.
> ## e.g. kopt=root=/dev/hda1 ro
> ##      kopt_2_6_8=root=/dev/hdc1 ro
> ##      kopt_2_6_8_2_686=root=/dev/hdc2 ro
> # kopt=root=UUID=909f7c32-639a-469d-b34b-b418d2b6a2dc ro
> 
> ## default grub root device
> ## e.g. groot=(hd0,0)
> # groot=909f7c32-639a-469d-b34b-b418d2b6a2dc
> 
> ## should update-grub create alternative automagic boot options
> ## e.g. alternative=true
> ##      alternative=false
> # alternative=true
> 
> ## should update-grub lock alternative automagic boot options
> ## e.g. lockalternative=true
> ##      lockalternative=false
> # lockalternative=false
> 
> ## additional options to use with the default boot option, but not with
> the
> ## alternatives
> ## e.g. defoptions=vga=791 resume=/dev/hda5
> # defoptions=quiet splash
> 
> ## should update-grub lock old automagic boot options
> ## e.g. lockold=false
> ##      lockold=true
> # lockold=false
> 
> ## Xen hypervisor options to use with the default Xen boot option
> # xenhopt=dom0_max_vcpus=1 dom0_mem=8192
> 
> ## Xen Linux kernel options to use with the default Xen boot option
> # xenkopt=console=tty0
> 
> ## altoption boot targets option
> ## multiple altoptions lines are allowed
> ## e.g. altoptions=(extra menu suffix) extra boot options
> ##      altoptions=(recovery) single
> # altoptions=(recovery mode) single
> 
> ## controls how many kernels should be put into the menu.lst
> ## only counts the first occurence of a kernel, not the
> ## alternative kernel options
> ## e.g. howmany=all
> ##      howmany=7
> # howmany=all
> 
> ## specify if running in Xen domU or have grub detect automatically
> ## update-grub will ignore non-xen kernels when running in domU and vice
> versa
> ## e.g. indomU=detect
> ##      indomU=true
> ##      indomU=false
> # indomU=detect
> 
> ## should update-grub create memtest86 boot option
> ## e.g. memtest86=true
> ##      memtest86=false
> # memtest86=true
> 
> ## should update-grub adjust the value of the default booted system
> ## can be true or false
> # updatedefaultentry=false
> 
> ## should update-grub add savedefault to the default options
> ## can be true or false
> # savedefault=false
> 
> ## ## End Default Options ##
> 
> title           Xen 4.0.0 / Debian GNU/Linux, kernel 2.6.31.13
> root            (hd0,0)
> kernel          /boot/xen-4.0.0.gz 
> module          /boot/vmlinuz-2.6.31.13 root=/dev/sda1 ro 
> 
> title           Xen 3.4.2 / Debian GNU/Linux, kernel 2.6.31.8-xenapr2010
> root            (hd0,0)
> kernel          /boot/xen-3.4.2.gz 
> module          /boot/vmlinuz-2.6.31.8-xenapr2010 root=/dev/sda1 ro
> console=tty0 
> module          /boot/initrd.img-2.6.31.8-xenapr2010
> 
> ### END DEBIAN AUTOMAGIC KERNELS LIST
> 
> 
> Please paste your dom0 grub.conf.
> Are you using memory ballooning? 
> 
> -- Pasi
> 

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