Re: [CentOS-virt] Cannot allocate Memory

[Shaun Reitan]

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


------ Original Message ------
From: "Pasi Kärkkäinen" <pa...@iki.fi>
To: "Shaun Reitan" <shaun.rei...@ndchost.com>; "Discussion about the 
virtualization on CentOS" <centos-virt@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


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