netdev - Re: network namespace bloat

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Message-ID: <CANn89iJ2auNoChr3FuFh-AGaPaw5_wwqfjZrtup1+xu6reVHMA@mail.gmail.com>
Date:	Tue, 10 Feb 2015 18:55:39 -0800
From:	Eric Dumazet <edumazet@...gle.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	roopa <roopa@...ulusnetworks.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Dinesh Dutt <ddutt@...ulusnetworks.com>,
	Vipin Kumar <vipin@...ulusnetworks.com>,
	Shmulik Ladkani <shmulik.ladkani@...il.com>,
	David Ahern <dsahern@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: network namespace bloat

On Tue, Feb 10, 2015 at 6:42 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:

>
> Those large hash tables impact creation speed as large memory
> allocations require more work from the memory allocators, and they
> affect reliability of as order > 0 pages are not reliabily available in
> the kernel.  So from a network namespace perspective I would really like
> to convert the per network namespace hash tables to hash tables that
> have a single instance across all network namespaces.
>

tcp_metric can fallback to vzalloc() after commit 976a702ac9eea ?

There is nothing preventing to use a single tcp_metric, a bit like
global TCP hash table.

We only have to convert the thing...

Note : At Google we do not save tcp metrics.
We have to use it only for FastOpen cookies eventually (For clients)
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