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Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devic
From: |
Yan Zhao |
Subject: |
Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices |
Date: |
Fri, 29 May 2020 00:15:17 -0400 |
User-agent: |
Mutt/1.9.4 (2018-02-28) |
On Thu, May 28, 2020 at 04:59:06PM -0600, Alex Williamson wrote:
> On Wed, 27 May 2020 09:48:22 +0100
> "Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:
> > * Yan Zhao (yan.y.zhao@intel.com) wrote:
> > > BTW, for viommu, the downtime data is as below. under the same network
> > > condition and guest memory size, and no running dirty data/memory produced
> > > by device.
> > > (1) viommu off
> > > single-round dirty query: downtime ~100ms
> >
> > Fine.
> >
> > > (2) viommu on
> > > single-round dirty query: downtime 58s
> >
> > Youch.
>
> Double Youch! But we believe this is because we're getting the dirty
> bitmap one IOMMU leaf page at a time, right? We've enable the kernel
> to get a dirty bitmap across multiple mappings, but QEMU isn't yet
> taking advantage of it. Do I have this correct? Thanks,
>
Yes, I think so, but I haven't looked into it yet.
Thanks
Yan
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, (continued)
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Yan Zhao, 2020/05/25
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Kirti Wankhede, 2020/05/25
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Alex Williamson, 2020/05/26
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Yan Zhao, 2020/05/27
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Dr. David Alan Gilbert, 2020/05/27
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Yan Zhao, 2020/05/28
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Alex Williamson, 2020/05/28
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Dr. David Alan Gilbert, 2020/05/29
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Alex Williamson, 2020/05/28
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices,
Yan Zhao <=
- Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices, Kirti Wankhede, 2020/05/29