2 * 100Gbps RDMA network cards, single client write throughput can only reach 6GiB/s ???

Deploy 6 storage nodes(24 * nvmeSSD per node), all with 2 * 100Gbps network cards, network card model
0000:17:00.0 Ethernet controller: Mellanox Technologies MT2892 Family [ConnectX-6 Dx]
0000:17:00.1 Ethernet controller: Mellanox Technologies MT2892 Family [ConnectX-6 Dx]

Client fio can only run at 6GiB/s, the fio command is as follows:
```
/root/3fs/fio --name=500M_1M_bigio_write -numjobs=100 -fallocate=none \
-ioengine=external:/usr/lib64/hf3fs_usrbio.so -direct=1 -rw=write -bs=1MB \
--group_reporting -filesize=500MB --nrfiles=10 -iodepth=1 \
--directory=/3fs/stage/500M_1M_bigio_write -mountpoint=/3fs/stage -ior_depth=1
```


Does this capability meet 3FS expectations? Are there other optimization parameters that are not enabled?