The rdma_recv_block_type block does not actually take effect.

[randomkang]

Describe the bug

When we use rdma_recv_block_type such as "huge-2MB", because the IOBuf::DEFAULT_BLOCK_SIZE is 8KB, the func "cut_into_sglist_and_iobuf" always cut 8KB for every ibv_sge.

If the max sge is 32, we only can send a maximum of 256KB(KB64) of data at a time, instead of 2MB.

To Reproduce

Expected behavior

Versions
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Compiler:
brpc:
protobuf:

Additional context/screenshots