linux-kernel - Re: [PATCH v6 14/25] rtrs: a bit of documentation

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Date:   Thu, 2 Jan 2020 14:21:24 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Jack Wang <jinpuwang@...il.com>, linux-block@...r.kernel.org,
        linux-rdma@...r.kernel.org
Cc:     axboe@...nel.dk, hch@...radead.org, sagi@...mberg.me,
        leon@...nel.org, dledford@...hat.com, danil.kipnis@...ud.ionos.com,
        jinpu.wang@...ud.ionos.com, rpenyaev@...e.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 14/25] rtrs: a bit of documentation

On 12/30/19 2:29 AM, Jack Wang wrote:
> diff --git a/Documentation/ABI/testing/sysfs-class-rtrs-client b/Documentation/ABI/testing/sysfs-class-rtrs-client
> new file mode 100644
> index 000000000000..8b219cf6c5c4
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-class-rtrs-client
> @@ -0,0 +1,190 @@
> +What:		/sys/class/rtrs-client
> +Date:		Jan 2020
> +KernelVersion:	5.6
> +Contact:	Jack Wang <jinpu.wang@...ud.ionos.com> Danil Kipnis <danil.kipnis@...ud.ionos.com>
> +Description:
> +When a user of RTRS API creates a new session, a directory entry with
> +the name of that session is created under /sys/class/rtrs-client/<session-name>/

Thank you for having included this ABI description. This is very 
helpful. Please follow the format documented in Documentation/ABI/README 
and make sure that all text, including the description, start in column 
17 and please use tabs for indentation.

> diff --git a/drivers/infiniband/ulp/rtrs/README b/drivers/infiniband/ulp/rtrs/README
> new file mode 100644
> index 000000000000..59ad60318a18
> --- /dev/null
> +++ b/drivers/infiniband/ulp/rtrs/README
> @@ -0,0 +1,149 @@
> +****************************
> +InfiniBand Transport (RTRS)
> +****************************
> +
> +RTRS (InfiniBand Transport) is a reliable high speed transport library
> +which provides support to establish optimal number of connections
> +between client and server machines using RDMA (InfiniBand, RoCE, iWarp)
> +transport. It is optimized to transfer (read/write) IO blocks.

Is it explained somewhere how the optimal number of connections is 
determined and also according to which metric the number of connections 
is optimized? Is the number of connections chosen to minimize latency, 
maximize IOPS or perhaps to optimize yet another metric?

Thanks,

Bart.