Merge branch 'net-smc-send-and-write-inline-optimization-for-smc'
Guangguan Wang says: ==================== net/smc: send and write inline optimization for smc 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) ==================== Link: https://lore.kernel.org/r/20220516055137.51873-1-guangguan.wang@linux.alibaba.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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