Am Freitag, 27. Januar 2017, 08:52:50 CET schrieb Alex Williamson:
> On Fri, 27 Jan 2017 11:58:05 +0100
>
> Jan Wiele <j...@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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