https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263604
Bug ID: 263604
Summary: ifconfig: Low performance with many interface/IP
Product: Base System
Version: Unspecified
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Created attachment 233531
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=233531&action=edit
ifconfig: disabled sort-grouping patch
Colleagues, Good Day.
We have several service routers FreeBSD with thousands of interfaces and
IP-addresses. With more than a thousand interfaces/IP, the command ifconfig
execution speed degrades.
The problem occurred when making the inet/inet6 grouping on each interface. The
change was in:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197270
https://svnweb.freebsd.org/base?view=revision&revision=278080
https://cgit.freebsd.org/src/commit/sbin/ifconfig/ifconfig.c?id=35c73e51cc801af670588c3fc7e72dc612d5a746
If you remove the call to the sort-grouping function sortifaddrs() in main(),
then the degradation of performance disappears. See attached patch
ifconfig_sort_disabled.patch .
Judging by the document https://wiki.freebsd.org/BootTime , the development
team is struggling to reduce the system boot time. I assure you, disabling
grouping in ifconfig significantly reduces the system boot time with thousands
of interfaces. I hope the development team will be interested in disabling
grouping in "some cases" to speed up the download. It may be possible to
implement disabling grouping by some ifconfig option used at the time of
loading in scripts rc.d.
Thanks. Peaceful sky.
Example.
Router have 1407 IP-addresses on 3597 interfaces.
ifconfig -a | grep inet | wc -l ; ifconfig -l | wc -w
1407
3597
Execute original ifconfig. Have 1.481 seconds user time.
time ifconfig vlan430
vlan430: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: OPTIC-BBN
options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
ether a0:36:9f:11:d6:30
inet 10.250.234.96 netmask 0xffffff00 broadcast 10.250.234.255
groups: vlan CoNet
vlan: 430 vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
1.481u 0.007s 0:01.91 77.4% 144+216k 0+0io 0pf+0w
Execute after patch ifconfig. Have 0.000 seconds user time.
time ifconfig vlan430
vlan430: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: OPTIC-BBN
options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
ether a0:36:9f:11:d6:30
inet 10.250.234.96 netmask 0xffffff00 broadcast 10.250.234.255
groups: vlan CoNet
vlan: 430 vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
0.000u 0.010s 0:00.01 100.0% 224+336k 0+0io 0pf+0w
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