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Commit Graph

11 Commits

Author SHA1 Message Date
Zbigniew Jędrzejewski-Szmek
16b65d7f46 sysctl: add some hints how to override settings
Also a link to decent documentation for sysrq keys. It is surprising
hard to find.

https://lists.fedoraproject.org/pipermail/devel/2015-February/208412.html
2015-02-26 19:07:38 -05:00
Michal Schmidt
e6c253e363 sysctl.d: default to fq_codel, fight bufferbloat
Quoting from Jon Corbet's report of Stephen Hemminger's talk at Linux
Plumbers Conference 2014 (https://lwn.net/Articles/616241/):

    [...] So Stephen encouraged everybody to run a command like:

    sysctl -w net.core.default_qdisc=fq_codel

    That will cause fq_codel to be used for all future connections
    [Qdiscs apply to interfaces, not connections. Pointed out by TomH
    in the article comments. -- mschmidt] (up to the next reboot).
    Unfortunately, the default queuing discipline cannot be changed,
    since it will certainly disturb some user's workload somewhere.

Let's have the recommended default in systemd.

Thanks to Dave Täht for advice and the summary at
https://lists.bufferbloat.net/pipermail/cerowrt-devel/2014-October/003701.html
2014-10-20 18:19:00 +02:00
Lennart Poettering
1836bf9e1d sysctl: always write net.ipv4.conf.all.xyz= in addition to net.ipv4.conf.default.xyz=
Otherwise we have a boot-time race, where interfaces that popped up
after the sysctl service would get the settings applied, but all others
wouldn't.
2014-08-15 12:07:33 +02:00
Tom Gundersen
ad8bc9ea50 sysctl.d: enable promote_secondaries by default
Without this, secondary addresses would get deleted when the primary one is. This is not
the desired behavior when one would like to transition from one address to another in the
same subnet (such as when a new IP address is given over DHCP).

In networkd, when given a new IP over DHCP we will add it, without explicitly removing the
old one first (and hence never have a window without an IP address configured). Assuming the
addresses are in the same subnet, that means that the old address is the primary and the new
address is the secondary one. Once the old address expires, the kernel will drop it. With the
old behavior this means that both addresses would be lost, which is clearly not what we want.
With the new behavior, only the old address is lost, and the new one is promoted to primary.

Reported by Michael Olbrich <m.olbrich@pengutronix.de>
2014-07-25 11:18:12 +02:00
Zbigniew Jędrzejewski-Szmek
5146e7e8ae man: add systemd-coredump(8) and a bunch of links 2014-07-13 21:11:07 -04:00
Kay Sievers
0f59fe5171 sysctl: default - add safe sysrq options 2013-03-15 19:30:53 +01:00
Kay Sievers
8f27a2212e sysctl: add 50-default.conf 2013-03-15 16:37:58 +01:00
Kay Sievers
94c525f076 sysctl: coredump.conf -> 50-coredump.conf 2013-03-15 15:59:21 +01:00
Zbigniew Jędrzejewski-Szmek
1d98d9a62c man: fix compilation of example 2013-03-07 00:45:56 -05:00
Lennart Poettering
5430f7f2bc relicense to LGPLv2.1 (with exceptions)
We finally got the OK from all contributors with non-trivial commits to
relicense systemd from GPL2+ to LGPL2.1+.

Some udev bits continue to be GPL2+ for now, but we are looking into
relicensing them too, to allow free copy/paste of all code within
systemd.

The bits that used to be MIT continue to be MIT.

The big benefit of the relicensing is that closed source code may now
link against libsystemd-login.so and friends.
2012-04-12 00:24:39 +02:00
Lennart Poettering
f5e04665eb journal: hook up coredumping with journal 2012-01-14 01:54:33 +01:00