CCing Marcel
On 23/08/2021 11:33, Li Zhijian wrote: > Previous qemu are facing 2 problems when migrating a fsdax memory backend with > RDMA protocol. > (1) ibv_reg_mr failed with Operation not supported > (2) requester(source) side could receive RNR NAK. > > For the (1), we can try to register memory region with ODP feature which > has already been implemented in some modern HCA hardware/drivers. > For the (2), IB provides advise API to prefetch pages in specific memory > region. It can help driver reduce the page fault on responder(destination) > side during RDMA_WRITE. > > CC: marcel.apfelb...@gmail.com > > Li Zhijian (2): > migration/rdma: Try to register On-Demand Paging memory region > migration/rdma: advise prefetch write for ODP region > > migration/rdma.c | 117 +++++++++++++++++++++++++++++++++-------- > migration/trace-events | 2 + > 2 files changed, 98 insertions(+), 21 deletions(-) >
