netdev - Re: [PATCH 1/2] Update description of net.sctp.sctp_rmem and net.sctp.sctp

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Date:	Mon, 4 Jul 2011 10:54:54 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Max Matveev <makc@...hat.com>
Cc:	linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] Update description of net.sctp.sctp_rmem and
 net.sctp.sctp_wmem tunables

On Mon, Jun 20, 2011 at 06:08:10PM +1000, Max Matveev wrote:
> sctp does not use second and third ("default" and "max") values
> of sctp_(r|w)mem tunables. The format is the same and tcp_(r|w)mem
> but the meaning is different so make the documentation explicit to
> avoid confusion.
> 
> Signed-off-by: Max Matveev <makc@...hat.com>
> ---
>  Documentation/networking/ip-sysctl.txt |   11 +++++++++--
>  1 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
> index d3d653a..f37d374 100644
> --- a/Documentation/networking/ip-sysctl.txt
> +++ b/Documentation/networking/ip-sysctl.txt
> @@ -1465,10 +1465,17 @@ sctp_mem - vector of 3 INTEGERs: min, pressure, max
>  	Default is calculated at boot time from amount of available memory.
>  
>  sctp_rmem - vector of 3 INTEGERs: min, default, max
> -	See tcp_rmem for a description.
> +	Only the first value ("min") is used, "default" and "max" are
> +	ignored and may be removed in the future versions.
> +
Its accurate to say that only the first value is usd currently, but because of
the way this sysctl is contructed (its used by the sysctl_rmem pointer in the
sctp_prot struct, which expects an array of three integers in the commong
__sk_mem_schedule function), we wont' be removing the other two values.  Drop
that bit and its an ack from me.
Neil

> +	min: Minimal size of receive buffer used by SCTP socket.
> +	It is guaranteed to each STCP socket (but not association) even 
> +	under moderate memory pressure.
> +
> +	Default: 1 page
>  
>  sctp_wmem  - vector of 3 INTEGERs: min, default, max
> -	See tcp_wmem for a description.
> +	Currently this tunable has no effect.
>  
>  addr_scope_policy - INTEGER
>  	Control IPv4 address scoping - draft-stewart-tsvwg-sctp-ipv4-00
> -- 
> 1.7.3.3
> 
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