From: Martin Josefsson <gandalf@mjufs.se>
To: Stephen Hemminger <shemminger@vyatta.com>
Cc: paulmck@linux.vnet.ibm.com, David Miller <davem@davemloft.net>,
paulus@samba.org, mingo@elte.hu, torvalds@linux-foundation.org,
laijs@cn.fujitsu.com, jeff.chua.linux@gmail.com,
dada1@cosmosbay.com, jengelh@medozas.de, kaber@trash.net,
r000n@r000n.net, linux-kernel@vger.kernel.org,
netfilter-devel@vger.kernel.org, netdev@vger.kernel.org,
benh@kernel.crashing.org
Subject: Re: [PATCH] netfilter: use per-cpu spinlock rather than RCU
Date: Mon, 13 Apr 2009 21:06:10 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.62.0904132102030.10428@wlug.westbo.se> (raw)
In-Reply-To: <20090413095309.631cf395@nehalam>
On Mon, 13 Apr 2009, Stephen Hemminger wrote:
> This is an alternative version of ip/ip6/arp tables locking using
> per-cpu locks. This avoids the overhead of synchronize_net() during
> update but still removes the expensive rwlock in earlier versions.
>
> The idea for this came from an earlier version done by Eric Duzamet.
> Locking is done per-cpu, the fast path locks on the current cpu
> and updates counters. The slow case involves acquiring the locks on
> all cpu's.
Doesn't spin_lock() result in a pipeline flush on x86?
iirc there was a benchmark in an RCU paper that tested using per cpu
spin_locks and the result was that it didn't scale well at all.
/Martin
next prev parent reply other threads:[~2009-04-13 19:33 UTC|newest]
Thread overview: 254+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-10 9:15 iptables very slow after commit784544739a25c30637397ace5489eeb6e15d7d49 Jeff Chua
2009-04-10 16:52 ` Stephen Hemminger
2009-04-11 1:07 ` Jeff Chua
2009-04-11 1:25 ` David Miller
2009-04-11 1:39 ` iptables very slow after commit 784544739a25c30637397ace5489eeb6e15d7d49 Linus Torvalds
2009-04-11 4:15 ` Paul E. McKenney
2009-04-11 5:14 ` Jan Engelhardt
2009-04-11 5:42 ` Paul E. McKenney
2009-04-11 6:00 ` David Miller
2009-04-11 18:12 ` Kyle Moffett
2009-04-11 18:12 ` Kyle Moffett
2009-04-11 18:32 ` Arkadiusz Miskiewicz
2009-04-11 18:32 ` Arkadiusz Miskiewicz
2009-04-12 0:54 ` david
2009-04-12 5:05 ` Kyle Moffett
2009-04-12 5:05 ` Kyle Moffett
2009-04-12 12:30 ` Harald Welte
2009-04-12 16:38 ` Jan Engelhardt
2009-04-11 15:07 ` Stephen Hemminger
2009-04-11 16:05 ` Jeff Chua
2009-04-11 16:05 ` Jeff Chua
2009-04-11 17:51 ` Linus Torvalds
2009-04-11 7:08 ` Ingo Molnar
2009-04-11 15:05 ` Stephen Hemminger
2009-04-11 17:48 ` Paul E. McKenney
2009-04-12 10:54 ` Ingo Molnar
2009-04-12 11:34 ` Paul Mackerras
2009-04-12 17:31 ` Paul E. McKenney
2009-04-13 1:13 ` David Miller
2009-04-13 4:04 ` Paul E. McKenney
2009-04-13 16:53 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU Stephen Hemminger
2009-04-13 17:40 ` Eric Dumazet
2009-04-13 17:40 ` Eric Dumazet
2009-04-13 18:11 ` Stephen Hemminger
2009-04-13 19:06 ` Martin Josefsson [this message]
2009-04-13 19:17 ` Linus Torvalds
2009-04-13 22:24 ` Andrew Morton
2009-04-13 23:20 ` Stephen Hemminger
2009-04-13 23:26 ` Andrew Morton
2009-04-13 23:37 ` Linus Torvalds
2009-04-13 23:52 ` Ingo Molnar
2009-04-14 12:27 ` Patrick McHardy
2009-04-14 14:23 ` Eric Dumazet
2009-04-14 14:45 ` Stephen Hemminger
2009-04-14 15:49 ` Eric Dumazet
2009-04-14 15:49 ` Eric Dumazet
2009-04-14 16:51 ` Jeff Chua
2009-04-14 18:17 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU (v2) Stephen Hemminger
2009-04-14 19:28 ` Eric Dumazet
2009-04-14 21:11 ` Stephen Hemminger
2009-04-14 21:13 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3) Stephen Hemminger
2009-04-14 21:40 ` Eric Dumazet
2009-04-14 21:40 ` Eric Dumazet
2009-04-15 10:59 ` Patrick McHardy
2009-04-15 10:59 ` Patrick McHardy
2009-04-15 16:31 ` Stephen Hemminger
2009-04-15 16:31 ` Stephen Hemminger
2009-04-15 20:55 ` Stephen Hemminger
2009-04-15 21:07 ` Eric Dumazet
2009-04-15 21:55 ` Jan Engelhardt
2009-04-16 12:12 ` Patrick McHardy
2009-04-16 12:24 ` Jan Engelhardt
2009-04-16 12:24 ` Jan Engelhardt
2009-04-16 12:31 ` Patrick McHardy
2009-04-16 12:31 ` Patrick McHardy
2009-04-15 21:57 ` [PATCH] netfilter: use per-cpu rwlock rather than RCU (v4) Stephen Hemminger
2009-04-15 23:48 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3) David Miller
2009-04-16 0:01 ` Stephen Hemminger
2009-04-16 0:05 ` David Miller
2009-04-16 12:28 ` Patrick McHardy
2009-04-16 0:10 ` Linus Torvalds
2009-04-16 0:45 ` [PATCH] netfilter: use per-cpu spinlock and RCU (v5) Stephen Hemminger
2009-04-16 5:01 ` Eric Dumazet
2009-04-16 13:53 ` Patrick McHardy
2009-04-16 13:53 ` Patrick McHardy
2009-04-16 14:47 ` Paul E. McKenney
2009-04-16 14:47 ` Paul E. McKenney
2009-04-16 16:10 ` [PATCH] netfilter: use per-cpu recursive spinlock (v6) Eric Dumazet
2009-04-16 16:10 ` Eric Dumazet
2009-04-16 16:20 ` Eric Dumazet
2009-04-16 16:20 ` Eric Dumazet
2009-04-16 16:37 ` Linus Torvalds
2009-04-16 16:59 ` Patrick McHardy
2009-04-16 17:58 ` Paul E. McKenney
2009-04-16 17:58 ` Paul E. McKenney
2009-04-16 18:41 ` Eric Dumazet
2009-04-16 20:49 ` [PATCH[] netfilter: use per-cpu reader-writer lock (v0.7) Stephen Hemminger
2009-04-16 21:02 ` Linus Torvalds
2009-04-16 23:04 ` Ingo Molnar
2009-04-17 0:13 ` [PATCH] netfilter: use per-cpu recursive spinlock (v6) Paul E. McKenney
2009-04-17 0:13 ` Paul E. McKenney
2009-04-16 13:11 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3) Patrick McHardy
2009-04-16 22:33 ` David Miller
2009-04-16 23:49 ` Paul E. McKenney
2009-04-16 23:52 ` [PATCH] netfilter: per-cpu spin-lock with recursion (v0.8) Stephen Hemminger
2009-04-17 0:15 ` Jeff Chua
2009-04-17 5:55 ` Peter Zijlstra
2009-04-17 6:03 ` Eric Dumazet
2009-04-17 6:14 ` Eric Dumazet
2009-04-17 6:14 ` Eric Dumazet
2009-04-17 17:08 ` Peter Zijlstra
2009-04-17 11:17 ` Patrick McHardy
2009-04-17 11:17 ` Patrick McHardy
2009-04-17 1:28 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3) Paul E. McKenney
2009-04-17 2:19 ` Mathieu Desnoyers
2009-04-17 5:05 ` Paul E. McKenney
2009-04-17 5:44 ` Mathieu Desnoyers
2009-04-17 14:51 ` Paul E. McKenney
2009-04-17 4:50 ` Stephen Hemminger
2009-04-17 5:08 ` Paul E. McKenney
2009-04-17 5:16 ` Eric Dumazet
2009-04-17 5:16 ` Eric Dumazet
2009-04-17 5:40 ` Paul E. McKenney
2009-04-17 5:40 ` Paul E. McKenney
2009-04-17 8:07 ` David Miller
2009-04-17 15:00 ` Paul E. McKenney
2009-04-17 17:22 ` Peter Zijlstra
2009-04-17 17:32 ` Linus Torvalds
2009-04-17 6:12 ` Peter Zijlstra
2009-04-17 16:33 ` Paul E. McKenney
2009-04-17 16:51 ` Peter Zijlstra
2009-04-17 21:29 ` Paul E. McKenney
2009-04-18 9:40 ` Evgeniy Polyakov
2009-04-18 14:14 ` Paul E. McKenney
2009-04-20 17:34 ` [PATCH] netfilter: use per-cpu recursive lock (v10) Stephen Hemminger
2009-04-20 18:21 ` Paul E. McKenney
2009-04-20 18:25 ` Eric Dumazet
2009-04-20 18:25 ` Eric Dumazet
2009-04-20 20:32 ` Stephen Hemminger
2009-04-20 20:42 ` Stephen Hemminger
2009-04-20 21:05 ` Paul E. McKenney
2009-04-20 21:05 ` Paul E. McKenney
2009-04-20 21:23 ` Paul Mackerras
2009-04-20 21:58 ` Paul E. McKenney
2009-04-20 22:41 ` Paul Mackerras
2009-04-20 23:01 ` [PATCH] netfilter: use per-cpu recursive lock (v11) Stephen Hemminger
2009-04-21 3:41 ` Lai Jiangshan
2009-04-21 3:56 ` Eric Dumazet
2009-04-21 4:15 ` Stephen Hemminger
2009-04-21 5:22 ` Lai Jiangshan
2009-04-21 5:45 ` Stephen Hemminger
2009-04-21 5:45 ` Stephen Hemminger
2009-04-21 6:52 ` Lai Jiangshan
2009-04-21 8:16 ` Evgeniy Polyakov
2009-04-21 8:42 ` Lai Jiangshan
2009-04-21 8:49 ` David Miller
2009-04-21 8:55 ` Eric Dumazet
2009-04-21 9:22 ` Evgeniy Polyakov
2009-04-21 9:34 ` Lai Jiangshan
2009-04-21 9:34 ` Lai Jiangshan
2009-04-21 5:34 ` Lai Jiangshan
2009-04-21 5:34 ` Lai Jiangshan
2009-04-21 4:59 ` Eric Dumazet
2009-04-21 4:59 ` Eric Dumazet
2009-04-21 16:37 ` Paul E. McKenney
2009-04-21 5:46 ` Lai Jiangshan
2009-04-21 16:13 ` Linus Torvalds
2009-04-21 16:43 ` Stephen Hemminger
2009-04-21 16:50 ` Linus Torvalds
2009-04-21 18:02 ` Ingo Molnar
2009-04-21 18:15 ` Stephen Hemminger
2009-04-21 19:10 ` Ingo Molnar
2009-04-21 19:46 ` Eric Dumazet
2009-04-21 19:46 ` Eric Dumazet
2009-04-22 7:35 ` Ingo Molnar
2009-04-22 7:35 ` Ingo Molnar
2009-04-22 8:53 ` Eric Dumazet
2009-04-22 10:13 ` Jarek Poplawski
2009-04-22 11:26 ` Ingo Molnar
2009-04-22 11:39 ` Jarek Poplawski
2009-04-22 11:18 ` Ingo Molnar
2009-04-22 15:19 ` Linus Torvalds
2009-04-22 16:57 ` Eric Dumazet
2009-04-22 17:18 ` Linus Torvalds
2009-04-22 20:46 ` Jarek Poplawski
2009-04-22 17:48 ` Ingo Molnar
2009-04-21 21:04 ` Stephen Hemminger
2009-04-22 8:00 ` Ingo Molnar
2009-04-21 19:39 ` Ingo Molnar
2009-04-21 21:39 ` [PATCH] netfilter: use per-cpu recursive lock (v13) Stephen Hemminger
2009-04-22 4:17 ` Paul E. McKenney
2009-04-22 14:57 ` Eric Dumazet
2009-04-22 15:32 ` Linus Torvalds
2009-04-24 4:09 ` [PATCH] netfilter: use per-CPU recursive lock {XIV} Stephen Hemminger
2009-04-24 4:58 ` Eric Dumazet
2009-04-24 15:33 ` Patrick McHardy
2009-04-24 15:33 ` Patrick McHardy
2009-04-24 16:18 ` Stephen Hemminger
2009-04-24 16:18 ` Stephen Hemminger
2009-04-24 20:43 ` Jarek Poplawski
2009-04-25 20:30 ` [PATCH] netfilter: iptables no lockdep is needed Stephen Hemminger
2009-04-26 8:18 ` Jarek Poplawski
2009-04-26 18:24 ` [PATCH] netfilter: use per-CPU recursive lock {XV} Eric Dumazet
2009-04-26 18:56 ` Mathieu Desnoyers
2009-04-26 21:57 ` Stephen Hemminger
2009-04-26 22:32 ` Mathieu Desnoyers
2009-04-27 17:44 ` Peter Zijlstra
2009-04-27 18:30 ` [PATCH] netfilter: use per-CPU r**ursive " Stephen Hemminger
2009-04-27 18:54 ` Ingo Molnar
2009-04-27 19:06 ` Stephen Hemminger
2009-04-27 19:46 ` Linus Torvalds
2009-04-27 19:48 ` Linus Torvalds
2009-04-27 20:36 ` Evgeniy Polyakov
2009-04-27 20:58 ` Linus Torvalds
2009-04-27 21:40 ` Stephen Hemminger
2009-04-27 21:40 ` Stephen Hemminger
2009-04-27 22:24 ` Linus Torvalds
2009-04-27 23:01 ` Linus Torvalds
2009-04-27 23:03 ` Linus Torvalds
2009-04-28 6:58 ` Eric Dumazet
2009-04-28 6:58 ` Eric Dumazet
2009-04-28 11:53 ` David Miller
2009-04-28 12:40 ` Ingo Molnar
2009-04-28 13:43 ` David Miller
2009-04-28 13:52 ` Mathieu Desnoyers
2009-04-28 14:37 ` David Miller
2009-04-28 14:49 ` Mathieu Desnoyers
2009-04-28 15:00 ` David Miller
2009-04-28 16:24 ` [PATCH] netfilter: revised locking for x_tables Stephen Hemminger
2009-04-28 16:50 ` Linus Torvalds
2009-04-28 16:55 ` Linus Torvalds
2009-04-29 5:37 ` David Miller
2009-04-30 3:26 ` Jeff Chua
2009-04-30 3:26 ` Jeff Chua
2009-04-30 3:31 ` David Miller
2009-04-30 3:31 ` David Miller
2009-05-01 8:38 ` [PATCH] netfilter: use likely() in xt_info_rdlock_bh() Eric Dumazet
2009-05-01 16:10 ` David Miller
2009-04-28 15:42 ` [PATCH] netfilter: use per-CPU r**ursive lock {XV} Paul E. McKenney
2009-04-28 17:35 ` Christoph Lameter
2009-04-28 15:09 ` Linus Torvalds
2009-04-27 23:32 ` Linus Torvalds
2009-04-28 7:41 ` Peter Zijlstra
2009-04-28 14:22 ` Paul E. McKenney
2009-04-28 7:42 ` Jan Engelhardt
2009-04-26 19:31 ` [PATCH] netfilter: use per-CPU recursive " Mathieu Desnoyers
2009-04-26 20:55 ` Eric Dumazet
2009-04-26 20:55 ` Eric Dumazet
2009-04-26 21:39 ` Mathieu Desnoyers
2009-04-21 18:34 ` [PATCH] netfilter: use per-cpu recursive lock (v11) Paul E. McKenney
2009-04-21 20:14 ` Linus Torvalds
2009-04-20 23:44 ` [PATCH] netfilter: use per-cpu recursive lock (v10) Paul E. McKenney
2009-04-16 0:02 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU (v3) Linus Torvalds
2009-04-16 6:26 ` Eric Dumazet
2009-04-16 14:33 ` Paul E. McKenney
2009-04-15 3:23 ` David Miller
2009-04-14 17:19 ` [PATCH] netfilter: use per-cpu spinlock rather than RCU Stephen Hemminger
2009-04-11 15:50 ` iptables very slow after commit 784544739a25c30637397ace5489eeb6e15d7d49 Stephen Hemminger
2009-04-11 17:43 ` Paul E. McKenney
2009-04-11 18:57 ` Linus Torvalds
2009-04-12 0:34 ` Paul E. McKenney
2009-04-12 7:23 ` Evgeniy Polyakov
2009-04-12 16:06 ` Stephen Hemminger
2009-04-12 17:30 ` Paul E. McKenney
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