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(-)

-- 
2.24.3 (Apple Git-128)

Hello:

This series was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 16 May 2022 13:51:35 +0800 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [net-next,v3,1/2] net/smc: send cdc msg inline if qp has sufficient inline space
    https://git.kernel.org/netdev/net-next/c/b632eb069732
  - [net-next,v3,2/2] net/smc: rdma write inline if qp has sufficient inline space
    https://git.kernel.org/netdev/net-next/c/793a7df63071

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
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On 16/05/2022 07:51, Guangguan Wang wrote:
> 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(-)
> 

I like that change, thank you!

For the series:

Acked-by: Karsten Graul <kgraul@linux.ibm.com>