[PATCH net-next v2 0/2] net/smc: send and write inline optimization for smc

Guangguan Wang
2022-05-14T10:28:18Z

Send cdc msgs and write data inline if qp has sufficent inline
space, helps latency reducing.

In my test environment, which are 2 VMs running on the same
physical host and whose NICs(ConnectX-4Lx) are working on
SR-IOV mode, qperf shows 0.4us-1.3us improvement in latency.

Test command:
server: smc_run taskset -c 1 qperf
client: smc_run taskset -c 1 qperf <server ip> -oo \
msg_size:1:2K:*2 -t 30 -vu tcp_lat

The results shown below:
msgsize before after
1B 11.9 us 10.6 us (-1.3 us)
2B 11.7 us 10.7 us (-1.0 us)
4B 11.7 us 10.7 us (-1.0 us)
8B 11.6 us 10.6 us (-1.0 us)
16B 11.7 us 10.7 us (-1.0 us)
32B 11.7 us 10.6 us (-1.1 us)
64B 11.7 us 11.2 us (-0.5 us)
128B 11.6 us 11.2 us (-0.4 us)
256B 11.8 us 11.2 us (-0.6 us)
512B 11.8 us 11.3 us (-0.5 us)
1KB 11.9 us 11.5 us (-0.4 us)
2KB 12.1 us 11.5 us (-0.6 us)

Guangguan Wang (2):
net/smc: send cdc msg inline if qp has sufficient inline space
net/smc: rdma write inline if qp has sufficient inline space

net/smc/smc_ib.c | 1 +
net/smc/smc_tx.c | 17 ++++++++++++-----
net/smc/smc_wr.c | 5 ++++-
3 files changed, 17 insertions(+), 6 deletions(-)

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