Update documented default values for various TCP/UDP tunables

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.

Reviewed-by: Shan Wei <shanwei@cn.fujitsu.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Max Matveev <makc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 1a6de5b..e3df119 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -384,7 +384,7 @@ 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.
@@ -473,7 +473,7 @@ 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.
@@ -543,13 +543,13 @@ 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
 
 CIPSOv4 Variables: