Re: Cannot allocate Memory

["Shaun Reitan" <shaun.reitan@xxxxxxxxxxx>]

We're using the stock configuration, the dom0 is limited to 1024MB via 
grub.



------ Original Message ------
From: "Pasi Kärkkäinen" <pasik@xxxxxx>
To: "Shaun Reitan" <shaun.reitan@xxxxxxxxxxx>; "Discussion about the 
virtualization on CentOS" <centos-virt@xxxxxxxxxx>
Sent: 6/26/2016 9:30:57 AM
Subject: Re:  Cannot allocate Memory

> On Wed, Jun 22, 2016 at 05:45:05PM +0000, Shaun Reitan wrote:
> >     Any of you guys ever seen an issue with Xen 4.4 were xm cannot 
> > create a
> >     guest because of what looks like an issue allocating memory even 
> > though xm
> >     info shows like 5x the amount of free memory needed? We are still
> >     unfortunately still using xm... it's on my list, i know..
> >     We've had this happen on a couple hosts now.  Only way to resolve 
> > seams to
> >     be rebooting the host.  I'm going to update the host to latest Xen 
> > 4.4 now
> >     hoping this is a old bug.
> >     Here's from xen logs
> >     [2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:105)
> >     XendDomainInfo.create(['vm', ['name', 'xxx'], ['memory', 2048],
> >     ['on_xend_start', 'ignore'], ['on_xend_stop', 'ignore'], ['vcpus', 
> > 2],
> >     ['oos', 1], ['image', ['linux', ['kernel', 
> > '/kernels/vmlinux-2.6.18.8-4'],
> >     ['videoram', 4], ['args', 'root=/dev/xvda ro xencons=tty 
> > console=tty1 '],
> >     ['tsc_mode', 0], ['nomigrate', 0]]], ['s3_integrity', 1], 
> > ['device',
> >     ['vbd', ['uname', 'phy:vg/fs_6818'], ['dev', 'xvda'], ['mode', 
> > 'w']]],
> >     ['device', ['vbd', ['uname', 'phy:vg/fs_6819'], ['dev', 'xvdb'], 
> > ['mode',
> >     'w']]], ['device', ['vif', ['rate', '40mb/s'], ['mac',
> >     'FE:FD:48:01:F1:E7']]]])
> >     [2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:2504)
> >     XendDomainInfo.constructDomain
> >     [2016-06-22 09:13:50 1958] DEBUG (balloon:187) Balloon: 7602632 
> > KiB free;
> >     need 16384; done.
>
> Hmm.. so you're using (dom0) memory ballooning? You might want to 
> disable it.
> Things worked better without ballooning (at least with xend).
>
>
> -- Pasi
>
> >     [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:2566) (12, 
> > 'Cannot
> >     allocate memory')
> >     Traceback (most recent call last):
> >       File 
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
> >     line 2561, in _constructDomain
> >         target = self.info.target())
> >     Error: (12, 'Cannot allocate memory')
> >     [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:490) VM start 
> > failed
> >     Traceback (most recent call last):
> >       File 
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
> >     line 475, in start
> >         XendTask.log_progress(0, 30, self._constructDomain)
> >       File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", 
> > line
> >     209, in log_progress
> >         retval = func(*args, **kwds)
> >       File 
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
> >     line 2572, in _constructDomain
> >         raise VmError(failmsg)
> >     VmError: Creating domain failed: name=xxx
> >     [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:110) Domain 
> > construction
> >     failed
> >     Traceback (most recent call last):
> >       File 
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
> >     line 108, in create
> >         vm.start()
> >       File 
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
> >     line 475, in start
> >         XendTask.log_progress(0, 30, self._constructDomain)
> >       File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", 
> > line
> >     209, in log_progress
> >         retval = func(*args, **kwds)
> >       File 
> > "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
> >     line 2572, in _constructDomain
> >         raise VmError(failmsg)
> >     VmError: Creating domain failed: name=xxx
> >     --
> >     Shaun

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