tree ab9132564a33ee87fb6fc5f810b70531e9445ab5
parent 330e832abda923df06a4ca6d3faac6e9c1b42548
author Miroslav Urbanek <mu@miroslavurbanek.com> 1479739701 +0100
committer Steffen Klassert <steffen.klassert@secunet.com> 1479879429 +0100

flowcache: Increase threshold for refusing new allocations

The threshold for OOM protection is too small for systems with large
number of CPUs. Applications report ENOBUFs on connect() every 10
minutes.

The problem is that the variable net->xfrm.flow_cache_gc_count is a
global counter while the variable fc->high_watermark is a per-CPU
constant. Take the number of CPUs into account as well.

Fixes: 6ad3122a08e3 ("flowcache: Avoid OOM condition under preasure")
Reported-by: Lukáš Koldrt <lk@excello.cz>
Tested-by: Jan Hejl <jh@excello.cz>
Signed-off-by: Miroslav Urbanek <mu@miroslavurbanek.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>