From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Herbert Subject: [RFC net-next] net: Build IPv6 into kernel by default Date: Thu, 9 Jul 2015 13:42:29 -0700 Message-ID: <1436474549-491618-1-git-send-email-tom@herbertland.com> Mime-Version: 1.0 Content-Type: text/plain Cc: To: , Return-path: Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:40580 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754031AbbGIUmg (ORCPT ); Thu, 9 Jul 2015 16:42:36 -0400 Received: from pps.filterd (m0044008 [127.0.0.1]) by mx0a-00082601.pphosted.com (8.14.5/8.14.5) with SMTP id t69KfU6N002610 for ; Thu, 9 Jul 2015 13:42:35 -0700 Received: from mail.thefacebook.com ([199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 1vhym40364-2 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT) for ; Thu, 09 Jul 2015 13:42:35 -0700 Received: from facebook.com (2401:db00:20:702e:face:0:23:0) by mx-out.facebook.com (10.102.107.97) with ESMTP id 072879ba267b11e5a9be0002c99331b0-9cffb2b0 for ; Thu, 09 Jul 2015 13:42:34 -0700 Sender: netdev-owner@vger.kernel.org List-ID: This patch makes the default to build IPv6 into the kernel. IPv6 now has significant traction and any remaining vestiges of IPv6 not being provided parity with IPv4 should be swept away. IPv6 is now core to the Internet and kernel. Points on IPv6 adoption: - Per Google statistics, IPv6 usage has reached 7% on the Internet and continues to exhibit an exponential growth rate https://www.google.com/intl/en/ipv6/statistics.html - Just a few days ago ARIN officially depleted its IPv4 pool - IPv6 only data centers are being successfully built (e.g. at Facebook) This patch changes the IPv6 Kconfig for IPV6. Default for CONFIG_IPV6 is set to "y" and the text has been updated to reflect the maturity of IPv6. Impact: Under some circumstances building modules in to kernel might have a performance advantage. In my testing, I did notice a very slight improvement. This will obviously increase the size of the kernel image. In my configuration I see: IPv6 as module: text data bss dec hex filename 9703666 1899288 933888 12536842 bf4c0a vmlinux IPv6 built into kernel text data bss dec hex filename 9436490 1879600 913408 12229498 ba9b7a vmlinux Which increases text size by ~270K (2.8% increase in size for me). If image size is an issue, presumably for a device which does not do IP networking (IMO we should be discouraging IPv4-only devices), IPV6 can be disabled or still built as a module. Signed-off-by: Tom Herbert --- net/ipv6/Kconfig | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig index 438a73a..a0016c5 100644 --- a/net/ipv6/Kconfig +++ b/net/ipv6/Kconfig @@ -5,16 +5,15 @@ # IPv6 as module will cause a CRASH if you try to unload it menuconfig IPV6 tristate "The IPv6 protocol" - default m + default y ---help--- - This is complemental support for the IP version 6. - You will still be able to do traditional IPv4 networking as well. + Support for IP version 6 (IPv6). For general information about IPv6, see . - For Linux IPv6 development information, see . - For specific information about IPv6 under Linux, read the HOWTO at - . + For specific information about IPv6 under Linux, see + Documentation/networking/ipv6.txt and read the HOWTO at + To compile this protocol support as a module, choose M here: the module will be called ipv6. -- 1.8.1