Is DMA in RDMA executed in order?

Infrastructure & Networking Software And Drivers Mellanox OFED
1

Hi.

I’m currently using CONNECTX-6 device for RDMA and have a question about how DMA is executed. In RDMA, sglist is used for gathering/transfering non-contiguous memory.

I’m wondering if this data copy(DMA from/to DRAM) and transfer is done serially, in the same order of sglists or if it works in parallel.

It is expected to use parallelism in PCIe but I could not find the specific information online.

Thanks.

2

I think there 2 things here you mixed.

For RDMA no require for host memory.

For transfer on PCIE, there is PCIE, within LANE(serially), and multi LANE(parallel).

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