From: Yan Zhao <yan.y.zhao@intel.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Kirti Wankhede <kwankhede@nvidia.com>,
cjia@nvidia.com, kevin.tian@intel.com, ziye.yang@intel.com,
changpeng.liu@intel.com, yi.l.liu@intel.com, mlevitsk@redhat.com,
eskultet@redhat.com, cohuck@redhat.com,
jonathan.davies@nutanix.com, eauger@redhat.com, aik@ozlabs.ru,
pasic@linux.ibm.com, felipe@nutanix.com,
Zhengxiao.zx@alibaba-inc.com, shuangtai.tst@alibaba-inc.com,
Ken.Xue@amd.com, zhi.a.wang@intel.com, qemu-devel@nongnu.org,
kvm@vger.kernel.org
Subject: Re: [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices
Date: Fri, 29 May 2020 00:15:17 -0400 [thread overview]
Message-ID: <20200529041516.GE1378@joy-OptiPlex-7040> (raw)
In-Reply-To: <20200528165906.7d03f689@x1.home>
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
next prev parent reply other threads:[~2020-05-29 4:25 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-18 5:56 [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 1/8] vfio: UAPI for migration interface for device state Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 2/8] vfio iommu: Remove atomicity of ref_count of pinned pages Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 3/8] vfio iommu: Cache pgsize_bitmap in struct vfio_iommu Kirti Wankhede
2020-05-20 10:08 ` Cornelia Huck
2020-05-20 14:46 ` Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 4/8] vfio iommu: Add ioctl definition for dirty pages tracking Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 5/8] vfio iommu: Implementation of ioctl " Kirti Wankhede
2020-05-18 21:53 ` Alex Williamson
2020-05-19 7:11 ` Kirti Wankhede
2020-05-19 6:52 ` Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 6/8] vfio iommu: Update UNMAP_DMA ioctl to get dirty bitmap before unmap Kirti Wankhede
2020-05-19 6:54 ` Kirti Wankhede
2020-05-20 10:27 ` Cornelia Huck
2020-05-20 15:16 ` Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 7/8] vfio iommu: Add migration capability to report supported features Kirti Wankhede
2020-05-20 10:42 ` Cornelia Huck
2020-05-20 15:23 ` Kirti Wankhede
2020-05-18 5:56 ` [PATCH Kernel v22 8/8] vfio: Selective dirty page tracking if IOMMU backed device pins pages Kirti Wankhede
2020-05-19 6:54 ` Kirti Wankhede
2020-05-19 16:58 ` [PATCH Kernel v22 0/8] Add UAPIs to support migration for VFIO devices Alex Williamson
2020-05-20 2:55 ` Yan Zhao
2020-05-20 13:40 ` Kirti Wankhede
2020-05-20 16:46 ` Alex Williamson
2020-05-21 5:08 ` Yan Zhao
2020-05-21 7:09 ` Kirti Wankhede
2020-05-21 7:04 ` Yan Zhao
2020-05-21 7:28 ` Kirti Wankhede
2020-05-21 7:32 ` Kirti Wankhede
2020-05-25 6:59 ` Yan Zhao
2020-05-25 13:20 ` Kirti Wankhede
2020-05-26 20:19 ` Alex Williamson
2020-05-27 6:23 ` Yan Zhao
2020-05-27 8:48 ` Dr. David Alan Gilbert
2020-05-28 8:01 ` Yan Zhao
2020-05-28 22:53 ` Alex Williamson
2020-05-29 11:12 ` Dr. David Alan Gilbert
2020-05-28 22:59 ` Alex Williamson
2020-05-29 4:15 ` Yan Zhao [this message]
2020-05-29 17:57 ` Kirti Wankhede
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