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From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
	David Miller <davem@davemloft.net>,
	netdev@vger.kernel.org, solar@openwall.com, vvs@virtuozzo.com,
	avagin@virtuozzo.com, xemul@virtuozzo.com,
	vdavydov@virtuozzo.com, khorenko@virtuozzo.com
Subject: Re: [RFC] net: ipv4 -- Introduce ifa limit per net
Date: Wed, 9 Mar 2016 20:09:21 +0300	[thread overview]
Message-ID: <20160309170921.GL2207@uranus.lan> (raw)
In-Reply-To: <20160309165850.GA49579@ast-mbp.thefacebook.com>

On Wed, Mar 09, 2016 at 08:58:52AM -0800, Alexei Starovoitov wrote:
...
> 
> above line is an indication that you have:
> #if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER)
> turning it off will speed up things significantly.

Look, this won't change the overall picture. For sure it will
speedup the kernel but it won't prevent the users from allowing
allocating addresses. So timings will drop a bit but the main
issue will remain -- there is no explicit way to limit this
resource. We can create say 1K of netnamespaces and allocate
100K addresses in each, then start destorying the namespaces
and node gonna be unreachable until everything is freed. The
kernel works as it shold simply in case of highload is stops
react due to big number of rtnl-locks taken.

	Cyrill

  reply	other threads:[~2016-03-09 17:09 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-04 21:39 [RFC] net: ipv4 -- Introduce ifa limit per net Cyrill Gorcunov
2016-03-04 22:50 ` David Miller
2016-03-05  0:08   ` Eric Dumazet
2016-03-05  4:11     ` David Miller
2016-03-05  7:18       ` Cyrill Gorcunov
2016-03-05 15:57       ` Cyrill Gorcunov
2016-03-05 16:33         ` David Miller
2016-03-05 17:00           ` Cyrill Gorcunov
2016-03-05 18:44           ` Cyrill Gorcunov
2016-03-06 10:09             ` Cyrill Gorcunov
2016-03-06 16:23               ` Eric Dumazet
2016-03-06 17:06                 ` Cyrill Gorcunov
2016-03-09 16:39                   ` Cyrill Gorcunov
2016-03-09 16:51                     ` Cyrill Gorcunov
2016-03-09 16:58                     ` Alexei Starovoitov
2016-03-09 17:09                       ` Cyrill Gorcunov [this message]
2016-03-09 17:24                         ` David Miller
2016-03-09 17:53                           ` Cyrill Gorcunov
2016-03-09 19:55                             ` Cyrill Gorcunov
2016-03-09 20:27                             ` David Miller
2016-03-09 20:41                               ` Cyrill Gorcunov
2016-03-09 20:47                                 ` David Miller
2016-03-09 20:57                                   ` Cyrill Gorcunov
2016-03-09 21:10                                     ` David Miller
2016-03-09 21:16                                       ` Cyrill Gorcunov
2016-03-10 10:20                                         ` Cyrill Gorcunov
2016-03-10 11:03                                           ` Cyrill Gorcunov
2016-03-10 15:09                                             ` Cyrill Gorcunov
2016-03-10 18:01                                               ` David Miller
2016-03-10 18:48                                                 ` Cyrill Gorcunov
2016-03-10 19:02                                                 ` Cong Wang
2016-03-10 19:55                                                   ` David Miller
2016-03-10 20:01                                                     ` Cyrill Gorcunov
2016-03-10 20:03                                                       ` David Miller
2016-03-10 20:13                                                         ` Cyrill Gorcunov
2016-03-10 20:19                                                           ` Cyrill Gorcunov
2016-03-10 21:05                                                           ` David Miller
2016-03-10 21:19                                                             ` Cyrill Gorcunov
2016-03-10 21:59                                                               ` Cyrill Gorcunov
2016-03-10 22:36                                                                 ` David Miller
2016-03-10 22:40                                                                   ` Cyrill Gorcunov
2016-03-11 20:40                                                                     ` David Miller
2016-03-11 20:58                                                                       ` Florian Westphal
2016-03-11 21:00                                                                       ` Cyrill Gorcunov
2016-03-11 21:22                                                                       ` Cyrill Gorcunov
2016-03-11 21:59                                                                         ` Cyrill Gorcunov
2016-03-14  3:29                                                                           ` David Miller
2016-03-10 21:09                                                     ` Cong Wang
2016-03-09 17:19                     ` David Miller
2016-03-05  6:58   ` Cyrill Gorcunov

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