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doc/nvmf: Update nvmf_create_transport example

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Some users refer to this document as an example of
"gold" RDMA configuration. But some parameters of
RDMA transport are not optimal for good performance,
e.g. `-c 0` disables in-capsule data, that reduces
IOPS of write operations with small payload; `-m 4`
allows to have only 4 qpairs per controller, that
doesn't allow to have more than 4 IO qpairs.
This patch sets several parameters which are default
for RDMA.

Signed-off-by: Alexey Marchuk <alexeymar@mellanox.com>
Reported-by: Mike Gerdts <mgerdts@nvidia.com>
Change-Id: I118bb032eaf7f38e981d06ee312b36c7f0c8322a
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/11454
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
This commit is contained in:
Alexey Marchuk 2022-02-08 18:16:19 +03:00 committed by Tomasz Zawadzki
parent 84bec316c2
commit adde7ea533
1 changed files with 3 additions and 3 deletions
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doc/nvmf.md
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@ -152,13 +152,13 @@ working with NVMe over Fabrics specific RPCs can be found on the @ref jsonrpc_co
Start the nvmf_tgt application with elevated privileges. Once the target is started,
the nvmf_create_transport rpc can be used to initialize a given transport. Below is an
example where the target is started and configured with two different transports.
The RDMA transport is configured with an I/O unit size of 8192 bytes, 4 max qpairs per controller,
and an in capsule data size of 0 bytes. The TCP transport is configured with an I/O unit size of
The RDMA transport is configured with an I/O unit size of 8192 bytes, max I/O size 131072 and an
in capsule data size of 8192 bytes. The TCP transport is configured with an I/O unit size of
16384 bytes, 8 max qpairs per controller, and an in capsule data size of 8192 bytes.
~~~{.sh}
build/bin/nvmf_tgt
scripts/rpc.py nvmf_create_transport -t RDMA -u 8192 -m 4 -c 0
scripts/rpc.py nvmf_create_transport -t RDMA -u 8192 -i 131072 -c 8192
scripts/rpc.py nvmf_create_transport -t TCP -u 16384 -m 8 -c 8192
~~~