RE: [Xen-users] Why cannt I boot 128 ttylinux VMs?

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Liao, Guangdeng
> Sent: 26 June 2007 06:04
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Why cannt I boot 128 ttylinux VMs?
> 
> Hey all,
> 
> I am a new Xen user and trying to boot up 128 VM on the 
> machine with 16G
> memory. All VM images are ttylinux. When I booted up 116 Virtual
> machines, I can not boot VM anymore. Once I create a new VM, 
> the latest
> VM on the machine would be kicked out to hold 116 VM simultaneously.
> Since I set VM memory to 32M, the Memory should not be an issue. I am
> wondering why I can not boot 128 VM and why the limit of VM is 116? Is
> there any way to configure the limit? I am looking forward to 
> your help.
> Any suggestion or idea would be highly appreciated!
> 
You are most likely running out of the Xen Heap - in 32-bit it's
defaulting to 12MB, in 64-bit it's 16MB. 

If you're using 64-bit, all you need to do is set "xenheap_megabytes=XX"
on the command-line for xen.gz in your boot configuration. 

For 32-bit, it's a bit harder, as it's a "compiled in" option. You need
to change DIRECTMAP_MBYTES in .../xen/include/asm-x86/config.h to make
the heap bigger. 

Since you want 128 VM's and you get 116, you shouldn't need to increase
it very much, just one or two MB would probably be sufficient. 

--
Mats



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