On Tue, Sep 08, 2015 at 01:46:52PM +0100, Dr. David Alan Gilbert wrote: > * Bharata B Rao (bharata@xxxxxxxxxxxxxxxxxx) wrote: > > On Tue, Sep 08, 2015 at 09:59:47AM +0100, Dr. David Alan Gilbert wrote: > > > * Bharata B Rao (bharata@xxxxxxxxxxxxxxxxxx) wrote: > > > > In fact I had successfully done postcopy migration of sPAPR guest with > > > > this setup. > > > > > > Interesting - I'd not got that far myself on power; I was hitting a problem > > > loading htab ( htab_load() bad index 2113929216 (14848+0 entries) in htab stream (htab_shift=25) ) > > > > > > Did you have to make any changes to the qemu code to get that happy? > > > > I should have mentioned that I tried only QEMU driven migration within > > the same host using wp3-postcopy branch of your tree. I don't see the > > above issue. > > > > (qemu) info migrate > > capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks: off compress: off x-postcopy-ram: on > > Migration status: completed > > total time: 39432 milliseconds > > downtime: 162 milliseconds > > setup: 14 milliseconds > > transferred ram: 1297209 kbytes > > throughput: 270.72 mbps > > remaining ram: 0 kbytes > > total ram: 4194560 kbytes > > duplicate: 734015 pages > > skipped: 0 pages > > normal: 318469 pages > > normal bytes: 1273876 kbytes > > dirty sync count: 4 > > > > I will try migration between different hosts soon and check. > > I hit that on the same host; are you sure you've switched into postcopy mode; > i.e. issued a migrate_start_postcopy before the end of migration? Sorry I was following your discussion with Li in this thread https://www.marc.info/?l=qemu-devel&m=143035620026744&w=4 and it wasn't obvious to me that anything apart from turning on the x-postcopy-ram capability was required :( So I do see the problem now. At the source ------------- Error reading data from KVM HTAB fd: Bad file descriptor Segmentation fault At the target ------------- htab_load() bad index 2113929216 (14336+0 entries) in htab stream (htab_shift=25) qemu-system-ppc64: error while loading state section id 56(spapr/htab) qemu-system-ppc64: postcopy_ram_listen_thread: loadvm failed: -22 qemu-system-ppc64: VQ 0 size 0x100 Guest index 0x0 inconsistent with Host index 0x1f: delta 0xffe1 qemu-system-ppc64: error while loading state for instance 0x0 of device 'pci@800000020000000:00.0/virtio-net' *** Error in `./ppc64-softmmu/qemu-system-ppc64': corrupted double-linked list: 0x00000100241234a0 *** ======= Backtrace: ========= /lib64/power8/libc.so.6Segmentation fault -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>