Tuning RWIN

[Kurt Wall]

An unnamed Administration source, Brett I. Holcomb, wrote:
% I've been having problems with low speed on my cable connection.  
% SpeedGuide shows a Default Receive Window (RWIN) of 5840 and indicates it's 
% limiting me.  Where do I change this?  According to one guide 
% /proc/sys/net/core/rmem_default is what should be tuned but that doesn't 
% seem to help.  
% 
% What do I need to adjust to increase RWIN and how do I do it.

>From $KERNEL_SRC/Documentation/filesystem/proc.txt:

/proc/sys/net/core - Network core options
-----------------------------------------

rmem_default
------------
The default setting of the socket receive buffer in bytes.

rmem_max
--------
The maximum receive socket buffer size in bytes.

netdev_max_backlog
------------------
Maximum number  of  packets,  queued  on  the  INPUT  side, when the interface
receives packets faster than kernel can process them.

Kurt
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