[SeaBIOS] [Qemu-devel] >256 Virtio-net-pci hotplug Devices

[Kinsella, Ray]

Hi Marcel,

On 24/07/2017 00:14, Marcel Apfelbaum wrote:
> On 24/07/2017 7:53, Kinsella, Ray wrote:
>
> Even if I am not aware of how much time would take to init a bare-metal
> PCIe Root Port, it seems too much.
>

So I repeated the testing for 64, 128, 256 and 512 ports. I ensured the 
configuration was sane, that 128 was twice the number of root ports and 
virtio-pci-net devices as 64.

I got the following results - shown in seconds, as you can see it is non 
linear but not exponential, there is something that is not scaling well.

		64	128	256	512
PCIe Root Ports	14	72	430	2672
ACPI		4	35	342	3863
Loading Drivers	1	1	31	621
Total Boot	34	137	890	7516

( I did try to test 1024 devices, but it just dies silently )

Ray K