git: DragonFly_RELEASE_5_4 kernel - Change tcp keepalive options from ms to seconds (DISRUPTIVE) (2)
dillon at crater.dragonflybsd.org
Sat Jul 6 17:51:47 PDT 2019
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Tue Jun 25 21:48:20 2019 -0700
kernel - Change tcp keepalive options from ms to seconds (DISRUPTIVE) (2)
* Refactor the code slightly to adopt the same limits and behavior
as linux. Instead of capping out we return EINVAL on any out-of-
* Also note that my history was wrong. Sephe actually implemented
these options, not me, and it was in 2011 (8 years ago, not 15+).
So much for my vague memory! At the time other operating used wildly
different metrics, and we chose to use milliseconds. But in the
intervening years it looks like the main systems have adopted a
In changing our parameters to match, we avoid a lot of pain when
porting third party applications that use it, particularly chrome.
But also a few others.
If we need sub-second parameters in the future we will implement
new option keywords for it.
Summary of changes:
sys/netinet/tcp_usrreq.c | 40 ++++++++++++++++------------------------
1 file changed, 16 insertions(+), 24 deletions(-)
DragonFly BSD source repository
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