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Date:	Wed, 16 Nov 2011 18:39:05 -0800
From:	David Decotigny <>
Cc:	"David S. Miller" <>,
	Ian Campbell <>,
	Eric Dumazet <>,
	Jeff Kirsher <>,
	Ben Hutchings <>,
	Jiri Pirko <>, Joe Perches <>,
	Szymon Janc <>,
	Richard Jones <>,
	Ayaz Abdulla <>,
	David Decotigny <>
Subject: [PATCH net-next v6 3/9] kbuild: document RPS/XPS network Kconfig options

This adds a description of RPS/XPS options and allow them to be
changed at make menuconfig time.

It also fixes following checkpatch syntax warnings:
ERROR: trailing whitespace
+^I  $

ERROR: trailing whitespace

Signed-off-by: David Decotigny <>
 net/Kconfig |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/net/Kconfig b/net/Kconfig
index a073148..991379e 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -10,7 +10,7 @@ menuconfig NET
 	  The reason is that some programs need kernel networking support even
 	  when running on a stand-alone machine that isn't connected to any
 	  other computer.
 	  If you are upgrading from an older kernel, you
 	  should consider updating your networking tools too because changes
 	  in the kernel and the tools often go hand in hand. The tools are
@@ -217,20 +217,32 @@ source "net/dns_resolver/Kconfig"
 source "net/batman-adv/Kconfig"
 config RPS
-	boolean
+	boolean "Enable Receive Packet Steering"
 	default y
+	help
+	  RPS distributes the load of received packet processing
+	  across multiple CPUs. If unsure, say Y.
 config RFS_ACCEL
-	boolean
+	boolean "Enable Hardware Acceleration of RFS"
 	depends on RPS && GENERIC_HARDIRQS
 	select CPU_RMAP
 	default y
+	help
+	  Allow drivers for multiqueue hardware with flow filter
+	  tables to accelerate RFS. If unsure, say Y.
 config XPS
-	boolean
+	boolean "Enable Transmit Packet Steering"
 	default y
+	help
+	  For multiqueue devices, XPS selects a transmit queue during
+	  packet transmission based on configuration. This is done by
+	  mapping the CPU transmitting the packet to a queue. XPS can
+	  reduce transmit network latency on SMP systems. If unsure,
+	  say Y.
 config HAVE_BPF_JIT
@@ -274,7 +286,6 @@ config NET_TCPPROBE
 	Documentation on how to use TCP connection probing can be found
 	To compile this code as a module, choose M here: the

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