From: "Michael R. Hines" <mrhi...@us.ibm.com> Please pull.
Changes since v5: - Removed max_size hook. - Waiting for Signed-Off bys.... Wiki: http://wiki.qemu.org/Features/RDMALiveMigration Github: g...@github.com:hinesmr/qemu.git Here is a brief summary of total migration time and downtime using RDMA: Using a 40gbps infiniband link performing a worst-case stress test, using an 8GB RAM virtual machine: Using the following command: $ apt-get install stress $ stress --vm-bytes 7500M --vm 1 --vm-keep RESULTS: 1. Migration throughput: 26 gigabits/second. 2. Downtime (stop time) varies between 15 and 100 milliseconds. EFFECTS of memory registration on bulk phase round: For example, in the same 8GB RAM example with all 8GB of memory in active use and the VM itself is completely idle using the same 40 gbps infiniband link: 1. x-rdma-pin-all disabled total time: approximately 7.5 seconds @ 9.5 Gbps 2. x-rdma-pin-all enabled total time: approximately 4 seconds @ 26 Gbps These numbers would of course scale up to whatever size virtual machine you have to migrate using RDMA. Enabling this feature does *not* have any measurable affect on migration *downtime*. This is because, without this feature, all of the memory will have already been registered already in advance during the bulk round and does not need to be re-registered during the successive iteration rounds. The following changes since commit f3aa844bbb2922a5b8393d17620eca7d7e921ab3: build: include config-{, all-}devices.mak after defining CONFIG_SOFTMMU and CONFIG_USER_ONLY (2013-04-24 12:18:41 -0500) are available in the git repository at: g...@github.com:hinesmr/qemu.git rdma_patch_v6 for you to fetch changes up to 75e6fac1f642885b93cefe6e1874d648e9850f8f: rdma: send pc.ram (2013-04-24 14:55:01 -0400) ---------------------------------------------------------------- Michael R. Hines (11): rdma: add documentation rdma: export yield_until_fd_readable() rdma: export throughput w/ MigrationStats QMP rdma: introduce qemu_file_mode_is_not_valid() rdma: export qemu_fflush() rdma: introduce ram_handle_compressed() rdma: introduce qemu_ram_foreach_block() rdma: new QEMUFileOps hooks rdma: introduce capability x-rdma-pin-all rdma: core logic rdma: send pc.ram Makefile.objs | 1 + arch_init.c | 59 +- configure | 29 + docs/rdma.txt | 404 ++++++ exec.c | 9 + hmp.c | 2 + include/block/coroutine.h | 6 + include/exec/cpu-common.h | 5 + include/migration/migration.h | 25 + include/migration/qemu-file.h | 30 + migration-rdma.c | 2707 +++++++++++++++++++++++++++++++++++++++++ migration.c | 27 + qapi-schema.json | 12 +- qemu-coroutine-io.c | 23 + savevm.c | 107 +- 15 files changed, 3398 insertions(+), 48 deletions(-) create mode 100644 docs/rdma.txt create mode 100644 migration-rdma.c -- 1.7.10.4
