[vfio-users] Memory allocation with numatune

[sL1pKn07 SpinFlo]

Can you share the New vcpu config?

Im intereses because have, more or less, the same configuration (2x xeon
x5650)

Greetings

El 27 ene. 2017 6:04 p. m., "Jan Wiele" <jan at wiele.org> escribió:

> Am Freitag, 27. Januar 2017, 08:52:50 CET schrieb Alex Williamson:
> > On Fri, 27 Jan 2017 11:58:05 +0100
> >
> > Jan Wiele <jan at wiele.org> wrote:
> > > Hi,
> > > I've two E5-2670 CPUs and want to pin a VM to a node. CPU pinning works
> > > fine, however memory allocation seems to happen randomly. Sometimes it
> is
> > > done on node 0, sometimes on node 1.
> > >
> > > My VM config: http://pastebin.com/raw/J6trq7gJ
> > > I'm on Arch Linux Kernel 4.8.13-1 with libvirt 2.4.0-2
> > >
> > > Any ideas?
> >
> > Looks like it should work to me.  I've certainly tested this sort of
> > setup on RHEL and Fedora in the past and it did the right thing.
>
> > Your
> > vcpupin actually looks a little off though, just like on the host, the
> > VM is going to enumerate cores then threads, this is why your numactl
> > info shows node0 w/ {0-7,16-23}, node1 w/ {8-15,24-31}, ie.
> > {cores,threads}.  By interleaving the node1 pinning as you've done, the
> > mapping is off in the VM.  For instance, the guest will think CPU0 and
> > CPU6 are threads on the same core, but they're mapped to CPU8 and CPU11
> > on the host, which are unrelated.
> Thanks! I will fix that. (I think I did this because of a user, who
> reported
> slightly better performance, in the old archlinux-vfio-thread)
>
> > I know that doesn't help your
> > numatune issue though.
>
> Do you know which part of the system will actually allocate the memory on
> the
> specified node? Should I see some information about this in the qemu
> command
> line parameters?
>
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