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                                            Tobez123

Open UCX 1.15.0 with Open MPI 4.1.1 - running osu_iallgather/osu_iallgatherv stucked when the message size reached 65536

osu_iallgatherv add `-x UCX_RC_MLX5_RX_QUEUE_LEN=8191` ![add UCX_RC_MLX5_RX_QUEUE_LEN](https://github.com/openucx/ucx/assets/81629833/d7f3de1c-ef73-4621-938f-933baf861e45)

Open UCX 1.15.0 with Open MPI 4.1.1 - running osu_iallgather/osu_iallgatherv stucked when the message size reached 65536

osu_iallgatherv add `-x UCX_RNDV_THRESH=8192` ![add UCX_RNDV_THRESH](https://github.com/openucx/ucx/assets/81629833/5dc75d5c-e064-45f2-927b-5ff442960208)

Open UCX 1.15.0 with Open MPI 4.1.1 - running osu_iallgather/osu_iallgatherv stucked when the message size reached 65536

osu_iallgather add `-x UCX_RC_MLX5_RX_QUEUE_LEN=8191` ![iallgather add UCX_RC_MLX5_RX_QUEUE_LEN](https://github.com/openucx/ucx/assets/81629833/f8a99365-331a-4cea-ab03-52f6039c7d1e)

Open UCX 1.15.0 with Open MPI 4.1.1 - running osu_iallgather/osu_iallgatherv stucked when the message size reached 65536

osu_iallgather add -x `UCX_RNDV_THRESH=8192` ![iallgather add UCX_RNDV_THRESH](https://github.com/openucx/ucx/assets/81629833/02a14a62-acce-4217-9ee4-58e8d192b468)

Open UCX 1.15.0 with Open MPI 4.1.1 - running osu_iallgather/osu_iallgatherv stucked when the message size reached 65536

Thanks for your reply！ Following screenshots are the results I have tried. 1. contains `UCX_TLS=sm,rc_x along` with `UCX_RNDV_THRESH=8192` ![iallgather+UCX_RNDV_THRESH](https://github.com/openucx/ucx/assets/81629833/0137c816-299b-4d8c-a19e-6af483c6fd6f) 2. doesn't contain `UCX_TLS=sm,rc_x` ![iallgather](https://github.com/openucx/ucx/assets/81629833/caffa6b9-bece-4484-92e2-4cc9ce45745c) 3. contains `UCX_TLS=sm,rc_x,dc` ![iallgather+UCX_TLS sm_rc_x_dc](https://github.com/openucx/ucx/assets/81629833/ebe5b837-f3ea-4846-9b2c-ca8a3bd8cafe)