65083b5fe3
The ip command would always lookup the network device index even when not necessary. This slows down operations like creating lots of VLAN's. David reported the original issue, this is an alternative patch that solves it in a slightly more general method. Using iproute2 to create a bridge and add 4094 vlans to it can take from 2 to 3 *minutes*. The reason is the extraneous call to ll_name_to_index. ll_name_to_index results in an ioctl(SIOCGIFINDEX) call which in turn invokes dev_load. If the index does not exist, which it won't when creating a new link, dev_load calls modprobe twice -- once for netdev-NAME and again for NAME. This is unnecessary overhead for each link create. When ip link is invoked for a new device, there is no reason to call ll_name_to_index for the new device. With this patch, creating a bridge and adding 4094 vlans takes less than 3 *seconds*. old: # time ip -batch ip-vlan.batch real 3m13.727s user 0m0.076s sys 0m1.959s new: # time ip -batch ip-vlan.batch real 0m3.222s user 0m0.044s sys 0m1.777s Reported-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> |
||
|---|---|---|
| bash-completion | ||
| bridge | ||
| devlink | ||
| doc/actions | ||
| etc/iproute2 | ||
| examples | ||
| genl | ||
| include | ||
| ip | ||
| lib | ||
| man | ||
| misc | ||
| netem | ||
| rdma | ||
| schema | ||
| tc | ||
| testsuite | ||
| tipc | ||
| .gitignore | ||
| COPYING | ||
| Makefile | ||
| README | ||
| README.decnet | ||
| README.devel | ||
| README.distribution | ||
| README.iproute2+tc | ||
| README.lnstat | ||
| configure | ||
README
This is a set of utilities for Linux networking.
Information:
https://wiki.linuxfoundation.org/networking/iproute2
Download:
http://www.kernel.org/pub/linux/utils/net/iproute2/
Stable version repository:
git://git.kernel.org/pub/scm/network/iproute2/iproute2.git
Development repository:
git://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git
How to compile this.
--------------------
1. libdbm
arpd needs to have the berkeleydb development libraries. For Debian
users this is the package with a name like libdbX.X-dev.
DBM_INCLUDE points to the directory with db_185.h which
is the include file used by arpd to get to the old format Berkeley
database routines. Often this is in the db-devel package.
2. make
The makefile will automatically build a config.mk file which
contains definitions of libraries that may or may not be available
on the system such as: ATM, ELF, MNL, and SELINUX.
3. To make documentation, cd to doc/ directory , then
look at start of Makefile and set correct values for
PAGESIZE=a4 , ie: a4 , letter ... (string)
PAGESPERPAGE=2 , ie: 1 , 2 ... (numeric)
and make there. It assumes, that latex, dvips and psnup
are in your path.
4. This package includes matching sanitized kernel headers because
the build environment may not have up to date versions. See Makefile
if you have special requirements and need to point at different
kernel include files.
Stephen Hemminger
stephen@networkplumber.org
Alexey Kuznetsov
kuznet@ms2.inr.ac.ru