linux-kernel - Re: [PATCH net-next v3 0/2] net/smc: send and write inline optimization for smc

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Date:   Mon, 16 May 2022 18:58:20 +0200
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     Guangguan Wang <guangguan.wang@...ux.alibaba.com>,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, leon@...nel.org, tonylu@...ux.alibaba.com
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 0/2] net/smc: send and write inline
 optimization for smc

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@...ux.ibm.com>