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From: | Kinsella, Ray |
Subject: | Re: [Qemu-devel] [PATCH 0/3 v2] virtio: improve virtio devices initialization time |
Date: | Wed, 17 Jan 2018 10:53:48 +0000 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 |
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
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