netdev - Re: After a while of system running no incoming UDP any more?

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Message-ID: <20170728121434.vld76q7kohzpmtk2@torres.zugschlus.de>
Date:   Fri, 28 Jul 2017 14:14:34 +0200
From:   Marc Haber <mh+netdev@...schlus.de>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org
Subject: Re: After a while of system running no incoming UDP any more?

On Fri, Jul 28, 2017 at 10:07:57AM +0200, Paolo Abeni wrote:
> Ad a workaround you can disable UDP early demux:
> 
> echo 0 > /proc/sys/net/ipv4/udp_early_demux
> 
> (will affect both ipv4 and ipv6).
> 
> and (if the system  is already into the bad state) increase the udp
> accounted memory limit, writing in /proc/sys/net/ipv4/udp_mem greater
> values than the current ones (the actual values depends on the system
> total memory).

I can confirm that these two changes make a system in bad state work
again immediately. Will try the patch on 4.12.4 later today.

Thanks for helping!

Greetings
Marc

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