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RE: [Xen-devel] [PATCH] Values of cpu_weight and cpu_cap are lost after

To: Olaf Hering <olaf@xxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] Values of cpu_weight and cpu_cap are lost after xend restart
From: "Dube, Lutz" <lutz.dube@xxxxxxxxxxxxxx>
Date: Mon, 30 Aug 2010 08:41:18 +0200
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Thread-topic: [Xen-devel] [PATCH] Values of cpu_weight and cpu_cap are lost after xend restart
Hi Olaf,

yes you are right, it's my mistake. The patch is not complete. 

After reading the managed SXP file the values of weight and cap are of 
type string not of type int. 
The original code (before my patch) overwrites these values with the given 
weight/cap or 
the default values. Both values have type int.
My patch leaves the values taken from managed SXP unchanged, if already set, 
so they have type string not int!

I have to convert the values of weight/cap to int. I will extend the patch.


-----Original Message-----
From: Olaf Hering [mailto:olaf@xxxxxxxxx] 
Sent: Friday, August 27, 2010 2:54 PM
To: Dube, Lutz
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] [PATCH] Values of cpu_weight and cpu_cap are lost 
after xend restart

On Tue, Aug 10, Dube, Lutz wrote:

> # HG changeset patch
> # User Lutz.Dube
> # Node ID ca2c8c262dbaa6b2521cec60af7cd688dabdf850
> # Parent  8992134dcfd0b9e1e86f4111e68a8aa48bd33c3c
> Values of cpu_weight and cpu_cap are lost after xend restart
> For managed domains in state 'halted' I always get default values
> for cpu_cap / cpu_weight after xend restart.
> This is because the names of parameters differ between a SXP file to
> create a VM (here the parameter names are cpu_cap / cpu_weight) and
> a SXP file of a managed VM (here vcpus_params (cap 0) (weight 0)).
> But XendConfig.py reads only cpu_cap / cpu_weight and if not found,
> default values are used.
> The patch reads first vcpus_params (cap, weight), if not found then cpu_cap,
> cpu_weight and if both parameters are missing it uses the default values.


does xen-unstable actually work for you after this change is applied?
xm start <guest> fails for me on SLES11, as first reported here:

My python skills are not good enough to fix it, and this change looks
like the only one between rev 21976:22019 that touches self.getWeight()
related code in XendDomainInfo.py

[2010-08-27 14:36:38 4654] ERROR (XendDomainInfo:488) VM start failed
Traceback (most recent call last):
  File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 
473, in start
    XendTask.log_progress(0, 30, self._constructDomain)
  File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line 209, in 
    retval = func(*args, **kwds)
  File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 
2618, in _constructDomain
    assert type(weight) == int

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