[CentOS-virt] Cannot allocate Memory

Mon Jul 25 09:12:06 UTC 2016
Pasi Kärkkäinen <pasik at iki.fi>

On Thu, Jun 30, 2016 at 11:24:03PM +0000, Shaun Reitan wrote:
> We're using the stock configuration, the dom0 is limited to 1024MB
> via grub.
> 

Did you try disabling dom0 memory ballooning in xend config ? Does that change anything? 


-- Pasi

> 
> 
> ------ Original Message ------
> From: "Pasi Kärkkäinen" <pasik at iki.fi>
> To: "Shaun Reitan" <shaun.reitan at ndchost.com>; "Discussion about the
> virtualization on CentOS" <centos-virt at centos.org>
> Sent: 6/26/2016 9:30:57 AM
> Subject: Re: [CentOS-virt] 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
> >
>