netdev - RE: [PATCH RFC/RFT net-next 00/17] net: Convert neighbor tables to per-namespace

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Date:   Thu, 26 Jul 2018 11:12:34 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'Eric W. Biederman'" <ebiederm@...ssion.com>,
        David Ahern <dsahern@...il.com>
CC:     Cong Wang <xiyou.wangcong@...il.com>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "nikita.leshchenko@...cle.com" <nikita.leshchenko@...cle.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Ido Schimmel <idosch@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        "Saeed Mahameed" <saeedm@...lanox.com>,
        Alexander Aring <alex.aring@...il.com>,
        "linux-wpan@...r.kernel.org" <linux-wpan@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RFC/RFT net-next 00/17] net: Convert neighbor tables to
 per-namespace

From: Eric W. Biederman
> Sent: 25 July 2018 18:38
...
> >> Further unless I misread something you are increasing the number of
> >> timers to 3 per namespace.  If I create create a thousand network
> >> namespaces that feels like it will hurt system performance overall.
> >
> > It seems to me the timers are per neighbor entry not table. The per
> > table ones are for proxies.
> 
> It seems I misread that bit when I was refreshing my memory on what
> everything is doing.  If we can already have 1024 timers that makes
> timers not a concern.

Surely it is enough to just have a timestamp in each entry.
Deletion of expired items need not be done until insert (which
has the table suitable locked) bumps into an expired item.

	David

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