netdev - Re: [PATCH] ipv6: enable net.ipv6.route sysctls in network namespace

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Message-ID: <20210921153203.GK15906@breakpoint.cc>
Date:   Tue, 21 Sep 2021 17:32:03 +0200
From:   Florian Westphal <fw@...len.de>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Alexander Kuznetsov <wwfq@...dex-team.ru>, netdev@...r.kernel.org,
        zeil@...dex-team.ru
Subject: Re: [PATCH] ipv6: enable net.ipv6.route sysctls in network namespace

Jakub Kicinski <kuba@...nel.org> wrote:
> On Tue, 21 Sep 2021 09:22:04 +0300 Alexander Kuznetsov wrote:
> > We want to increase route cache size in network namespace
> > created with user namespace. Currently ipv6 route settings
> > are disabled for non-initial network namespaces.
> > Since routes are per network namespace it is safe
> > to enable these sysctls.

Are routes accounted towards memcg or something like that?

Otherwise userns could start eating up memory by cranking the limit
up to 11 and just adds a gazillion routes?