Re: [PATCH v2 0/2] enable fsdax rdma migration
Hi Zhijian, On Mon, Aug 23, 2021 at 11:41 AM lizhij...@fujitsu.com wrote: > > 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(-) > > Series Reviewed-by: Marcel Apfelbaum Thanks, Marcel
Re: [PATCH v2 0/2] enable fsdax rdma migration
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(-) >
[PATCH v2 0/2] enable fsdax rdma migration
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(-) -- 2.31.1
