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Re: [Qemu-devel] [PATCH v8 00/54] Postcopy implementation
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v8 00/54] Postcopy implementation |
Date: |
Wed, 30 Sep 2015 11:53:04 +0100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
* Bharata B Rao (address@hidden) wrote:
> On Mon, Sep 28, 2015 at 05:51:39PM +0100, Dr. David Alan Gilbert (git) wrote:
> > From: "Dr. David Alan Gilbert" <address@hidden>
> >
> > This is the 8th cut of my version of postcopy.
> >
> > The userfaultfd linux kernel code is now in the upstream kernel
> > tree, and so 4.3-rc3 can be used without modification.
> >
> > This qemu series can be found at:
> > https://github.com/orbitfp7/qemu.git
> > on the wp3-postcopy-v8 tag
> >
> >
> > Testing status:
> > * Tested heavily on x86
> > * Smoke tested on aarch64 (so it does work on different page sizes)
> > * Power is unhappy for me (but gets further than the htab problem
> > v7 used to have) (I get a kvm run failed)
>
> Seems to be completing successfully on Power. But it takes 2min for the
> migration status to transition from setup to active.
>
> Host: 4.3.0-rc3+
> Guest: 4.3.0-rc3+
> QEMU: wp3-postcopy-v8 of your tree.
>
> # ./ppc64-softmmu/qemu-system-ppc64 --enable-kvm --nographic -machine pseries
> -m 8G,slots=32,maxmem=32G -device virtio-blk-pci,drive=rootdisk -drive
> file=/home/bharata/F20-snap1,if=none,cache=none,id=rootdisk,format=qcow2 -vga
> none -net nic,model=virtio -net user -redir tcp:2000::22 -smp 16,maxcpus=32
> -serial pty
>
> (qemu) migrate_set_capability x-postcopy-ram on
> (qemu) migrate -d tcp:localhost:4444
> (qemu) info migrate
> capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks:
> off compress: off events: off x-postcopy-ram: on
> Migration status: setup
> total time: 0 milliseconds
>
> same status for around 2min...
That's interesting; I saw that behaviour on my aarch64 box, but not on
my power box or on x86. Can you try using tcp:127.0.0.1:4444 to force
ipv4 (that fixed it for me on aarch64). On the aarch box I found that
it still happened with head of tree qemu and so decided it wasn't my
postcopy world; I'm assuming what's happening is that it's trying
to connect to the IPv6 address, timing out and then trying IPv4.
> (qemu) info migrate
> capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks:
> off compress: off events: off x-postcopy-ram: on
> Migration status: active
> total time: 130089 milliseconds
> expected downtime: 300 milliseconds
> setup: 24 milliseconds
> transferred ram: 79454 kbytes
> throughput: 50.09 mbps
> remaining ram: 7670688 kbytes
> total ram: 8388864 kbytes
> duplicate: 160684 pages
> skipped: 0 pages
> normal: 18860 pages
> normal bytes: 75440 kbytes
> dirty sync count: 1
>
> (qemu) migrate_start_postcopy
>
> (qemu) info migrate
> capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks:
> off compress: off events: off x-postcopy-ram: on
> Migration status: postcopy-active
> total time: 135627 milliseconds
> expected downtime: 43 milliseconds
> setup: 24 milliseconds
> transferred ram: 338598 kbytes
> throughput: 74.02 mbps
> remaining ram: 1688384 kbytes
> total ram: 8388864 kbytes
> duplicate: 1600406 pages
> skipped: 0 pages
> normal: 75258 pages
> normal bytes: 301032 kbytes
> dirty sync count: 0
> dirty pages rate: 98 pages
>
> (qemu) info migrate
> capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks:
> off compress: off events: off x-postcopy-ram: on
> Migration status: completed
> total time: 136898 milliseconds
> downtime: 685 milliseconds
> setup: 24 milliseconds
> transferred ram: 1194196 kbytes
> throughput: 72.00 mbps
> remaining ram: 0 kbytes
> total ram: 8388864 kbytes
> duplicate: 1810921 pages
> skipped: 0 pages
> normal: 286839 pages
> normal bytes: 1147356 kbytes
> dirty sync count: 2
Great; is the guest happy?
Dave
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH v8 46/54] postcopy: Check order of received target pages, (continued)
- [Qemu-devel] [PATCH v8 46/54] postcopy: Check order of received target pages, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 47/54] Round up RAMBlock sizes to host page sizes, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 48/54] Postcopy; Handle userfault requests, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 50/54] postcopy: Wire up loadvm_postcopy_handle_ commands, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 49/54] Start up a postcopy/listener thread ready for incoming page data, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 51/54] Postcopy: Mark nohugepage before discard, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 52/54] End of migration for postcopy, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 53/54] Disable mlock around incoming postcopy, Dr. David Alan Gilbert (git), 2015/10/01
- [Qemu-devel] [PATCH v8 54/54] Inhibit ballooning during postcopy, Dr. David Alan Gilbert (git), 2015/10/01
- Re: [Qemu-devel] [PATCH v8 00/54] Postcopy implementation, Bharata B Rao, 2015/10/08
- Re: [Qemu-devel] [PATCH v8 00/54] Postcopy implementation,
Dr. David Alan Gilbert <=
Re: [Qemu-devel] [PATCH v8 00/54] Postcopy implementation, Bharata B Rao, 2015/10/08