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Re: [libvirt] hugepages error: "hugetlbfs filesystem is not mounted"



On 03.10.11 15:20, Daniel P. Berrange wrote:
> On Mon, Oct 03, 2011 at 04:09:42PM +0200, Shahar Havivi wrote:
> > On 03.10.11 12:24, Daniel P. Berrange wrote:
> > > On Mon, Oct 03, 2011 at 01:09:31PM +0200, Shahar Havivi wrote:
> > > > Hi,
> > > > 
> > > > I am trying to run a VM (via VDSM) with hugepages and I am getting this error:
> > > > "virNetClientProgramDispatchError:170 : internal error hugetlbfs filesystem is not mounted"
> > > > 
> > > > 
> > > > hugepages is mounted with the proper permissions (36:36) in case of vdsm user,
> > > > this code use to work..., now I am at version: libvirt-0.9.4-12.el6.x86_64
> > > > 
> > > > output of few commands:
> > > > 
> > > > # tree /dev/hugepages/
> > > > /dev/hugepages/
> > > > `-- libvirt
> > > >     `-- qemu
> > > > 
> > > > # ll -n /dev/hugepages/libvirt/
> > > > total 0
> > > > drwxr-xr-x 2 36 36 0 Oct  3 12:46 qemu/
> > > 
> > > The user ID  '36:36' looks a little bit strange. Did you set that
> > this is the userid that vdsm use
> > > yourself ?  When libvirtd starts up, it should detect the mount
> > > point and then create the $MOUNT/libvirt/qemu directory itself,
> > > setting up the correct userid/groupid which i'd expect to be 
> > > 107:107 on Fedora/Rhel
> > > 
> > > In addition, was the hugetlbfs mount point actually mounted at
> > > the time libvirtd was started up ?  If you mount hugetlbfs after
> > > starting libvirtd, you will need to restart it to enable hugetlbs
> > > in libvirtd.
> > No, it was not mounted prior to libvirt startup
> 
> Looking at the libvirtd code, AFAICT, the only way libvirtd can generate
> that error message is if the hugetlbfs mount point was not present when
> it started. What does 
> 
>   # grep hugepages /proc/mounts 
> 
> show on the host in question ?
> 
> Does restarting libvirtd make it work
> 
> Daniel
Yes thanks,
When mounting the hugepages before libvirt start it works fine.

Thank you,
Shahar Havivi.
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