[vfio-users] vga passthrough on server boards
alex.l.williamson at gmail.com
Wed Oct 12 17:04:58 UTC 2016
On Wed, Oct 12, 2016 at 10:51 AM, Ethan Thomas <thomas.ethan at gmail.com>
> I've been using a SuperMicro X8DTH-iF for quite some time with no
> problems. However it's worth noting that with some generations of multi-cpu
> boards the PCI-E lanes and ram may be associated with a specific CPU, so
> you may need to adjust which slots and cores you associate with a
> particular VM for best performance.
I would go so far as to say this is true of any modern multi-socket system,
it's called NUMA, Non-Uniform Memory Access. You can use tools like lstopo
to identify the locality of memory, devices, and processors. Using memory
and CPU from the correct node is important for an VM, and an assigned
device should be an extra pull towards the I/O local node.
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