netdev - Re: [PATCH net-next] rds-tcp: Add module parameters to control sndbuf/rcvbuf size of RDS-TCP socket

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Date:	Fri, 11 Mar 2016 11:09:27 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:	netdev@...r.kernel.org, rds-devel@....oracle.com,
	santosh.shilimkar@...cle.com, davem@...emloft.net
Subject: Re: [PATCH net-next] rds-tcp: Add module parameters to control
 sndbuf/rcvbuf size of RDS-TCP socket

On Fri, 11 Mar 2016 13:29:49 -0500
Sowmini Varadhan <sowmini.varadhan@...cle.com> wrote:

>  
> -#define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024)
> +static int sndbuf_size = 16384;
> +module_param(sndbuf_size, int, 0444);
> +MODULE_PARM_DESC(sndbuf_size, "SO_SNDBUF size of kernel tcp socket");
> +
> +static int rcvbuf_size = 87380;
> +module_param(rcvbuf_size, int, 0444);
> +MODULE_PARM_DESC(rcvbuf_size, "SO_RCVBUF size of kernel tcp socket");

Module parameters are a problem for distributions and should only be used
as a last resort.