[kata-dev] 答复: [Announce] virtio-fs released with Kata Containers support

EJ Campbell ejc3 at oath.com
Tue Dec 18 06:11:08 UTC 2018


Hi Zhangwei,

Could you go into more detail on the use case for live migration on bare
metal?

Thanks,
EJ


On Mon, Dec 17, 2018 at 6:20 PM zhangwei (CR) <zhangwei555 at huawei.com>
wrote:

> Stefan, Eric,
>
> There isn't live migration requirement so far, but, I will take this as a
> potential requirement when Kata is growing more powerful.
> In my mind, this is rational as some of us are running kata on bare metal,
> in this scene, we don't have an infrastructure software such as OpenStack
> to guarantee the lifecycle of workload.
>
> Virtio-fs is in RFC state, it could be OK as long as it doesn't have
> native gap for supporting live migration,  and I will be glad to see it
> being listed in some roadmap.
>
> By the way, really nice work! We finally get a better option against 9pfs
> :-) Thanks!
>
> -----邮件原件-----
> 发件人: Ernst, Eric [mailto:eric.ernst at intel.com]
> 发送时间: 2018年12月17日 22:30
> 收件人: Stefan Hajnoczi <stefanha at redhat.com>
> 抄送: sweil at redhat.com; Qixuan Wu <qixuan.wu at linux.alibaba.com>; Graham
> Whaley <graham.whaley at gmail.com>; miklos at szeredi.hu;
> kata-dev at lists.katacontainers.io; swhiteho at redhat.com; vgoyal at redhat.com
> 主题: Re: [kata-dev] [Announce] virtio-fs released with Kata Containers
> support
>
> Stefan -
>
> No, there isn’t a live migration requirement for Kata (sorry for the top
> post).
>
> Eric
>
> > On Dec 17, 2018, at 6:27 AM, Stefan Hajnoczi <stefanha at redhat.com>
> wrote:
> >
> >> On Sun, Dec 16, 2018 at 09:09:48AM +0800, Qixuan Wu wrote:
> >> 1) Did you compare the performance to the virtio-blk raw or qcow2
> >> solution of normal virtual machine?
> >
> > Not yet.
> >
> > Guest and host page cache performance can dominate benchmarks, so we
> > typically use fio direct=1 with QEMU -drive cache=none (O_DIRECT) to
> > focus purely on disk I/O performance and not page cache.  The same
> > thing can be done with virtio-fs so that every I/O operation requires
> > communication with the host.  In theory virtio-fs should be comparable
> > to virtio-blk on raw.
> >
> > In real-world scenarios the page cache will be enabled, especially for
> > the virtio-fs DAX feature.  So I need to think carefully about what to
> > benchmark, but it will probably include both configurations.
> >
> >> 2) Whether does it impact live-migration of guest os ?
> >
> > Virtio-fs currently does not support live migration.  Is there a
> > requirement for live migration with Kata Containers use cases?
> >
> > Stefan
>
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