linux-kernel - [PATCH net-next v5 03/10] kbuild: document RPS/XPS network Kconfig options

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Message-Id: <e4bb76dfd9ddd0bd02d8897b15e7b4ee50af5b17.1321420513.git.david.decotigny@google.com>
Date:	Tue, 15 Nov 2011 21:15:51 -0800
From:	David Decotigny <david.decotigny@...gle.com>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ian Campbell <ian.campbell@...rix.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Jiri Pirko <jpirko@...hat.com>, Joe Perches <joe@...ches.com>,
	Szymon Janc <szymon@...c.net.pl>,
	Richard Jones <rick.jones2@...com>,
	Ayaz Abdulla <AAbdulla@...dia.com>,
	David Decotigny <david.decotigny@...gle.com>
Subject: [PATCH net-next v5 03/10] 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.



Signed-off-by: David Decotigny <david.decotigny@...gle.com>
---
 net/Kconfig |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/net/Kconfig b/net/Kconfig
index a073148..1422c34 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -217,20 +217,30 @@ source "net/dns_resolver/Kconfig"
 source "net/batman-adv/Kconfig"
 
 config RPS
-	boolean
+	boolean "Enable Receive Packet Steering"
 	depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
 	default y
+	  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
+	  This is the hardware version of RPS. On multi-queue network
+	  devices, this configures the hardware to distribute the
+	  received packets across multiple CPUs. If unsure, say Y.
 
 config XPS
-	boolean
+	boolean "Enable Transmit Packet Steering"
 	depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
 	default y
+	  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
 	bool
-- 
1.7.3.1

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