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David S. Miller db9ca5cacb Merge branch 'ipv4-Make-neigh-lookup-keys-for-loopback-point-to-point-devices-be-INADDR_ANY' 
Jim Westfall says:

====================
ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY

This used to be the previous behavior in older kernels but became broken in
a263b30936 (ipv4: Make neigh lookups directly in output packet path)
and then later removed because it was broken in 0bb4087cbe (ipv4: Fix neigh
lookup keying over loopback/point-to-point devices)

Not having this results in there being an arp entry for every remote ip
address that the device talks to.  Given a fairly active device it can
cause the arp table to become huge and/or having to add/purge large number
of entires to keep within table size thresholds.

$ ip -4 neigh show nud noarp | grep tun | wc -l
55850

$ lnstat -k arp_cache:entries,arp_cache:allocs,arp_cache:destroys -c 10
arp_cach|arp_cach|arp_cach|
 entries|  allocs|destroys|
   81493|620166816|620126069|
  101867|   10186|       0|
  113854|    5993|       0|
  118773|    2459|       0|
   27937|   18579|   63998|
   39256|    5659|       0|
   56231|    8487|       0|
   65602|    4685|       0|
   79697|    7047|       0|
   90733|    5517|       0|

v2:
 - fixes coding style issues
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2018-01-15 14:53:44 -05:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-10 17:53:18 -08:00
block block: drain queue before waiting for q_usage_counter becoming zero 2018-01-05 09:09:48 -07:00
certs License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-01-05 12:10:06 -08:00
Documentation doc: clarification about setting SO_ZEROCOPY 2018-01-10 15:01:49 -05:00
drivers sh_eth: fix dumping ARSTR 2018-01-15 14:50:46 -05:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-01-06 17:13:21 -08:00
include ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY 2018-01-15 14:53:43 -05:00
init Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2018-01-10 11:17:21 -05:00
ipc Rename superblock flags (MS_xyz -> SB_xyz) 2017-11-27 13:05:09 -08:00
kernel bpf, array: fix overflow in max_entries and undefined behavior in index_mask 2018-01-10 14:46:39 -08:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2018-01-10 11:17:21 -05:00
mm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-01-06 17:13:21 -08:00
net ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR_ANY 2018-01-15 14:53:43 -05:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2017-12-03 13:08:30 -05:00
scripts Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-15 11:44:59 -08:00
security - fix regression in mount mediation when feature set is pinned 2018-01-07 11:33:12 -08:00
sound ALSA: pcm: Allow aborting mutex lock at OSS read/write loops 2018-01-08 16:40:26 +01:00
tools bpf: arsh is not supported in 32 bit alu thus reject it 2018-01-10 14:42:22 -08:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM/ARM Fixes for v4.15, Round 2 2017-12-18 12:57:43 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild misc updates for v4.15 2017-11-17 17:51:33 -08:00
.mailmap mailmap: update Mark Yao's email address 2018-01-04 16:45:09 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-08 20:21:39 -08:00
Makefile Linux 4.15-rc7 2018-01-07 14:22:41 -08:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.