Re: [libvirt] Analysis of the effect of adding PCIe root ports
On Thu, Oct 06, 2016 at 10:00:39AM -0400, Laine Stump wrote:
* <controller type='usb' model='blah'> x 4 - a
set of USB2
controllers. This will turn into a single USB3 controller on a
root-port after my patches. Alternately, since it seems you don't
use it, you could eliminate it with:
Yup, this is auto-added, and a mistake.
I have sent a patch upstream adding:
<controller type='usb' model='none'/>
<memballoon model='none'/>
...
1) virtio-scsi controller
2) virtio-serial controller
and nothing else. Manually address those two to be on bus 0
(pcie-root), and (with my patches) you've reduced your PCI
device+controller count from the current 10 down to 3 (including the
sata controller).
Interesting. Is there any particular reason why we should or should
not use explicit PCI addresses for the remaining devices? What would
you recommend we do?
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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