Re: [Qemu-devel] [PATCH 0/3 v2] virtio: improve virtio devices initialization time

[Kinsella, Ray]

Hi Gal,

So the good news is that before I applied your patch I found that 
initialization time has improved.

For 128 virtio-net devices it has gone from 137s the last time I tested 
it, to 40s today.

The bad news is that for 256 virtio-net devices - it now just hangs.

However when I apply your patch - it now core dumps for 128 virtio-devices.

You can find the output here - https://pastebin.com/W4DXZ6J5.

My config is attached to this email.


On 17/01/2018 09:28, Gal Hammer wrote:
> Hi Ray,
>
> On Tue, Jan 16, 2018 at 5:40 PM, Kinsella, Ray <address@hidden> wrote:
> > Hi Gal,
> >
> >
> > I'm not sure my patch will help with your problem of multiple PCI
> > devices (lots of devices). My patch improves the eventfd registration
> > path while it seems that the source of your problem is either
> > limitation enforced by the PCI specifications or by the QEMU's PCI
> > emulation code.

Did you read down the thread to my timings?

https://marc.info/?l=qemu-devel&m=150100585427348&w=2

test_128.cfg
Description: Text document