netdev - Re: [PATCH 2/2] Update documented default values for various TCP/UDP tunables

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Message-ID: <20110704145820.GB10310@hmsreliant.think-freely.org>
Date:	Mon, 4 Jul 2011 10:58:20 -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 2/2] Update documented default values for various TCP/UDP
 tunables

On Wed, Jun 22, 2011 at 05:18:13PM +1000, Max Matveev wrote:
> tcp_rmem and tcp_wmem use 1 page as default value for the minimum
> amount of memory to be used, same as udp_wmem_min and udp_rmem_min.
> Pages are different size on different architectures - use the right
> units when describing the defaults.
> 
> Signed-off-by: Max Matveev <makc@...hat.com>
> ---
>  Documentation/networking/ip-sysctl.txt |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
> index f37d374..387ee53 100644
> --- a/Documentation/networking/ip-sysctl.txt
> +++ b/Documentation/networking/ip-sysctl.txt
> @@ -394,7 +394,7 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
>  	min: Minimal size of receive buffer used by TCP sockets.
>  	It is guaranteed to each TCP socket, even under moderate memory
>  	pressure.
> -	Default: 8K
> +	Default: 1 page
>  
>  	default: initial size of receive buffer used by TCP sockets.
>  	This value overrides net.core.rmem_default used by other protocols.
> @@ -483,7 +483,7 @@ tcp_window_scaling - BOOLEAN
>  tcp_wmem - vector of 3 INTEGERs: min, default, max
>  	min: Amount of memory reserved for send buffers for TCP sockets.
>  	Each TCP socket has rights to use it due to fact of its birth.
> -	Default: 4K
> +	Default: 1 page
>  
>  	default: initial size of send buffer used by TCP sockets.  This
>  	value overrides net.core.wmem_default used by other protocols.
> @@ -553,13 +553,13 @@ udp_rmem_min - INTEGER
>  	Minimal size of receive buffer used by UDP sockets in moderation.
>  	Each UDP socket is able to use the size for receiving data, even if
>  	total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
> -	Default: 4096
> +	Default: 1 page
>  
>  udp_wmem_min - INTEGER
>  	Minimal size of send buffer used by UDP sockets in moderation.
>  	Each UDP socket is able to use the size for sending data, even if
>  	total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
> -	Default: 4096
> +	Default: 1 page
>  
Acked-by: Neil Horman <nhorman@...driver.com>

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