On Thu, Nov 05, 2015 at 06:10:27PM +0000, Dr. David Alan Gilbert (git) wrote: > From: "Dr. David Alan Gilbert" <dgilb...@redhat.com> > > This is the 9th cut of my version of postcopy. > > The userfaultfd linux kernel code is now in the upstream kernel > tree, and so 4.3 can be used without modification. > > This qemu series can be found at: > https://github.com/orbitfp7/qemu.git > on the wp3-postcopy-v9 tag > > Testing status: > * Tested heavily on x86 > * Smoke tested on aarch64 (so it does work on different page sizes)
Tested minimally on ppc64 with back and forth postcopy migration of unloaded pseries guest within the localhost - works as expected. However I am seeing a failure in one case. I am not sure if this is a user error or a real issue in postcopy migration. If I switch to postcopy migration immediately after starting the migration, I see the migration failing with error: qemu-system-ppc64: qemu_savevm_send_packaged: Unreasonably large packaged state: 25905005 1. (qemu) migrate_set_capability x-postcopy-ram on 2. (qemu) migrate -d tcp:localhost:4444 3. (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: 4177 milliseconds expected downtime: 300 milliseconds setup: 75 milliseconds transferred ram: 115523 kbytes throughput: 155.69 mbps remaining ram: 30117196 kbytes total ram: 33554688 kbytes duplicate: 835311 pages skipped: 0 pages normal: 24061 pages normal bytes: 96244 kbytes dirty sync count: 1 4. (qemu) migrate_start_postcopy 5. (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: failed total time: 0 milliseconds If I run 'info migrate' in step 3 a few more times before step 4, then the migration succeeds. So is there a way to figure out when to switch over to postcopy migration ? QEMU cmdline: ./ppc64-softmmu/qemu-system-ppc64 --enable-kvm --nographic -vga none -machine pseries -m 32G,slots=32,maxmem=64G -smp 16 -device virtio-blk-pci,drive=rootdisk -drive file=/home/bharata/F20-snap1,if=none,cache=none,id=rootdisk,format=qcow2 -monitor telnet:127.0.0.1:1234,server,nowait Host: 4.3.0-rc7+ Regards, Bharata.
