* Lidong Chen (jemmy858...@gmail.com) wrote: > Current Qemu RDMA communication does not support send and receive > data at the same time, so when RDMA live migration with postcopy > enabled, the source qemu return path thread get qemu file error. > > Those patch add the postcopy support for RDMA live migration.
This description is a little misleading; it doesn't really do RDMA during the postcopy phase - what it really does is disable the RDMA page sending during the postcopy phase, relying on the RDMA codes stream emulation to send the page. That's not necessarily a bad fix; you get the nice performance of RDMA during the precopy phase, but how bad are you finding the performance during the postcopy phase - the RDMA code we have was only really designed for sending small commands over the stream? Dave > Lidong Chen (5): > migration: create a dedicated connection for rdma return path > migration: add the interface to set get_return_path > migration: implement the get_return_path for RDMA iochannel > migration: fix qemu carsh when RDMA live migration > migration: disable RDMA WRITR after postcopy started. > > migration/qemu-file-channel.c | 12 ++-- > migration/qemu-file.c | 13 +++- > migration/qemu-file.h | 2 +- > migration/rdma.c | 148 > ++++++++++++++++++++++++++++++++++++++++-- > 4 files changed, 163 insertions(+), 12 deletions(-) > > -- > 1.8.3.1 > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
