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


From: Kinsella, Ray
Subject: Re: [Qemu-devel] [PATCH 0/3 v2] virtio: improve virtio devices initialization time
Date: Tue, 16 Jan 2018 15:40:21 +0000
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

Hi Gal,

Brilliant - will test this in the next day or two.
Hopefully this will help resolve the issues I reported last summer.

http://lists.nongnu.org/archive/html/qemu-devel/2017-07/msg05268.html

Ray K

On 14/01/2018 10:06, Gal Hammer wrote:
A bug was reported about a very slow boot time and a 100% CPU usage of
both Windows and Linux guests when running a VM with multiple
virtio-serial devices (https://bugzilla.redhat.com/1528588).

For example, running a VM with 25 virtio-serial devices, each one with
max_ports=511, could have a boot time of around 30 minutes. With this
patch (and another patch to kvm) the boot time is reduced to
approximately 3 minutes.

The patch wraps all the changes made to the Memory Regions during the
eventfd registrations in a memory regions transaction. I had to add a
cleanup callback function to the EventNotifier struct, so it will be
possible to use a transaction in the shutdown code path as well.

Gal Hammer (3):
   qemu: add a cleanup callback function to EventNotifier
   virtio: postpone the execution of event_notifier_cleanup function
   virtio: improve virtio devices initialization time

  accel/kvm/kvm-all.c           |  4 ++++
  hw/virtio/virtio-bus.c        | 19 +++++++++++--------
  hw/virtio/virtio.c            |  5 +++++
  include/qemu/event_notifier.h |  1 +
  util/event_notifier-posix.c   |  5 ++++-
  util/event_notifier-win32.c   |  2 ++
  6 files changed, 27 insertions(+), 9 deletions(-)





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