Re: [Xen-users] Arinc653 does not run VM

[Nate Studer <nate.studer@xxxxxxxxxxxxxxx>]

On 11/25/2013 11:29 PM, Michael Davis wrote:
> Hi Nate, thanks for the tips, I've almost got my VMs running with that code 
> you linked to.  I ran into the unresponsive dom0 problem but I have been able 
> to get it to run after executing my scheduling code by using an all zeros 
> uuid.  However my VMs still aren't getting any CPU time.  I have confirmed 
> that I am using the correct uuids in my code and am registering them exactly 
> the same way as the original code and as the dom0.  Is there by chance 
> another step I might be missing?? Thanks for your help
> 

Did you convert the UUID string into an actual UUID?


By declaration:

   static const char DOM_UUID[16] = {0x64, 0x6F, 0x6D, 0x31};
                                 /* { 'd',  'o',  'm',  '1'} */

   ...

   memcpy((char *)sched.sched_entries[i].dom_handle,
          DOMN_UUID,
          sizeof(sched.sched_entries[i].dom_handle));

By using uuid_parse:

   #include <uuid/uuid.h>

   ...

   uuid_parse(DOMN_UUID_STRING, sched.sched_entries[i].dom_handle);

Or some other method?


The wiki did imply that this field is a string, but it is not.  This implication
has now been corrected.

     Nate


> -Mike
> 
> -----Original Message-----
> From: Nate Studer [mailto:nate.studer@xxxxxxxxxxxxxxx] 
> Sent: Wednesday, November 20, 2013 10:16 AM
> To: Michael Davis; xen-users@xxxxxxxxxxxxxxxxxxxx; Robbie VanVossen
> Subject: Re: [Xen-users] Arinc653 does not run VM
> 
> On 11/19/2013 7:13 PM, Michael Davis wrote:
>> Hi,
>>
>>  
>>
>> I am using Xen 4.2.3 installed on an Intel Atom with a Debian Dom0 and 
>> 3 Debian domU's installed.  I am trying to run some benchmarks using 
>> the Arinc653 scheduler.  I have edited my grub options to boot with 
>> 'maxcpus=1 sched=arinc653' options.  I can boot the dom0 and verify 
>> that the scheduler is enabled.  However when I xl create, the VM is 
>> created but I cannot connect a console to it.  Running xl list shows 
>> the vm but it has no state (------) and Time equals 0.0 .  The scheduler is 
>> clearly not allocating any time to the VM.
>> I am able to boot and run VMs using the sedf and credit schedulers fine. 
>>
>>  
>>
>> Does anyone have any idea what change I need to make to get the 
>> scheduler to run the VM?  I appreciate the help.
>>
> 
>   Either before creating the domain, or after creating it, you need to load a 
> schedule by calling xc_sched_arinc653_schedule_set.
> 
>   See the wiki page for an example of how to do this:
> http://wiki.xen.org/wiki/ARINC653_Scheduler .
> 
>   To get the UUID of your domain, you should either set the UUID of your 
> domain to a known value in the config file (preferred) or read the UUID from 
> xenstore.
> 
>   config file:
>      uuid = "646F6D31-0000-0000-0000-000000000000"
> 
>   xenstore read:
>      sudo xenstore-read /local/domain/<dom id>/vm
>      /vm/<UUID>
> 
>   The UUID of dom0 is "".  Make sure to put a slot in the schedule for dom0, 
> or else dom0 will stop running.
> 
>>  
>>
>> Here is my grub option:  
>>
>>  
>>
>> menuentry 'Debian GNU/Linux, with Xen 4.2.3 and Linux 3.2.0-4-686-pae' 
>> --class debian --class gnu-linux --class gnu --class os --class xen {
>>
>>         insmod part_msdos
>>
>>         insmod ext2
>>
>>         set root='(hd0,msdos1)'
>>
>>         search --no-floppy --fs-uuid --set=root 
>> 7fd8f884-066b-45f7-a3ad-426d445b96d4
>>
>>         echo    'Loading Xen 4.2.3 ...'
>>
>>         multiboot       /boot/xen-4.2.3.gz placeholder   maxcpus=1 
>> sched=arinc653
>>
>>         echo    'Loading Linux 3.2.0-4-686-pae ...'
>>
>>         module  /boot/vmlinuz-3.2.0-4-686-pae placeholder
>> root=UUID=7fd8f884-066b-45f7-a3ad-426d445b96d4 ro edd=off 
>> initrd=/install/initrd.gz
>>
>>         echo    'Loading initial ramdisk ...'
>>
>>         module  /boot/initrd.img-3.2.0-4-686-pae
>>
>>
> 
> Nothing looks wrong here, and in Xen 4.2.3 if your boot options deviate from 
> the supported ones for the arinc653 scheduler, obvious bad things will happen 
> (crash).  Since dom0 is booting, this should not be your problem.
> 
>>
>> result from xl list:
>>
>> Name                                        ID   Mem VCPUs           State   
>>  
>> Time(s)
>>
>> Domain-0                                     0  1342     1     r-----      
>> 41.7
>>
>> debvm1                                       2   512     1     ------       
>> 0.0
>>
>>  
>>
>> and xl cpupool-list
>>
>> Name               CPUs   Sched     Active   Domain count
>>
>> Pool-0               1  arinc653       y          2
>>
>>  
>>
>> And xl vcpu-list
>>
>> Name                                ID  VCPU   CPU State   Time(s) CPU 
>> Affinity
>>
>> Domain-0                             0     0    0   r--      49.8  any cpu
>>
>> debvm1                               2     0    0   ---       0.0  any cpu
>>
>>  
>>
>>  
>>
>> -Mike
>>
>>  
>>
>>  
>>
>>  
>>
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users
>>
> 


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