From: Peter Zijlstra <peterz@infradead.org>
To: David Miller <davem@davemloft.net>
Cc: jarkao2@gmail.com, Larry.Finger@lwfinger.net, kaber@trash.net,
torvalds@linux-foundation.org, akpm@linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-wireless@vger.kernel.org, mingo@redhat.com,
nickpiggin@yahoo.com.au, paulmck@linux.vnet.ibm.com
Subject: Re: Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98()
Date: Thu, 24 Jul 2008 12:08:56 +0200 [thread overview]
Message-ID: <1216894136.7257.266.camel@twins> (raw)
In-Reply-To: <20080724.023210.229338550.davem@davemloft.net>
On Thu, 2008-07-24 at 02:32 -0700, David Miller wrote:
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Thu, 24 Jul 2008 11:27:05 +0200
>
> > Well, not only lockdep, taking a very large number of locks is expensive
> > as well.
>
> Right now it would be on the order of 16 or 32 for
> real hardware.
>
> Much less than the scheduler currently takes on some
> of my systems, so currently you are the pot calling the
> kettle black. :-)
One nit, and then I'll let this issue rest :-)
The scheduler has a long lock dependancy chain (nr_cpu_ids rq locks),
but it never takes all of them at the same time. Any one code path will
at most hold two rq locks.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: jarkao2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
Larry.Finger-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org,
kaber-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org,
torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
nickpiggin-/E1597aS9LT0CCvOHzKKcA@public.gmane.org,
paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org
Subject: Re: Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98()
Date: Thu, 24 Jul 2008 12:08:56 +0200 [thread overview]
Message-ID: <1216894136.7257.266.camel@twins> (raw)
In-Reply-To: <20080724.023210.229338550.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
On Thu, 2008-07-24 at 02:32 -0700, David Miller wrote:
> From: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
> Date: Thu, 24 Jul 2008 11:27:05 +0200
>
> > Well, not only lockdep, taking a very large number of locks is expensive
> > as well.
>
> Right now it would be on the order of 16 or 32 for
> real hardware.
>
> Much less than the scheduler currently takes on some
> of my systems, so currently you are the pot calling the
> kettle black. :-)
One nit, and then I'll let this issue rest :-)
The scheduler has a long lock dependancy chain (nr_cpu_ids rq locks),
but it never takes all of them at the same time. Any one code path will
at most hold two rq locks.
--
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next prev parent reply other threads:[~2008-07-24 10:09 UTC|newest]
Thread overview: 255+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-20 17:44 [GIT]: Networking David Miller
2008-07-20 17:59 ` Arjan van de Ven
2008-07-20 23:52 ` David Miller
2008-07-21 20:32 ` David Miller
2008-07-21 0:54 ` Linus Torvalds
2008-07-21 1:03 ` David Miller
2008-07-21 1:09 ` Alexey Dobriyan
2008-07-21 1:14 ` David Miller
2008-07-21 1:22 ` Alexey Dobriyan
2008-07-21 2:40 ` Alexey Dobriyan
2008-07-21 2:48 ` David Miller
2008-07-21 5:11 ` David Miller
2008-07-21 9:48 ` Alexander Beregalov
2008-07-21 10:16 ` Ben Hutchings
2008-07-21 15:35 ` David Miller
2008-07-21 16:04 ` Alexander Beregalov
2008-07-21 11:57 ` Alexey Dobriyan
2008-07-21 15:27 ` David Miller
2008-07-21 16:49 ` Linus Torvalds
2008-07-21 16:53 ` David Miller
2008-07-21 1:20 ` Patrick McHardy
2008-07-21 11:28 ` Stefan Richter
2008-07-21 11:45 ` James Morris
2008-07-21 12:05 ` Patrick McHardy
2008-07-21 17:28 ` David Miller
2008-07-21 17:40 ` Linus Torvalds
2008-07-21 20:33 ` Patrick McHardy
2008-07-23 23:42 ` David Miller
2008-07-21 1:07 ` Linus Torvalds
2008-07-21 1:17 ` David Miller
2008-07-21 1:17 ` David Miller
2008-07-21 8:36 ` iwlwifi: fix build bug in "iwlwifi: fix LED stall" Ingo Molnar
2008-07-21 10:02 ` Winkler, Tomas
2008-07-21 10:53 ` Ingo Molnar
2008-07-21 12:12 ` [PATCH] iwlwifi: RS small compile warnings without CONFIG_IWLWIFI_DEBUG Tomas Winkler
2008-07-21 12:12 ` [PATCH] iwlwifi: " Tomas Winkler
2008-07-21 12:12 ` [PATCH] iwlwifi: compilation error when CONFIG_IWLWIFI_DEBUG is not set Tomas Winkler
2008-07-21 13:30 ` [crash, bisected] Kernel BUG at ffffffff8079afb1 (__netif_schedule()) Ingo Molnar
2008-07-21 13:45 ` [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370 Ingo Molnar
2008-07-21 14:30 ` Ingo Molnar
2008-07-21 15:04 ` Ingo Molnar
2008-07-21 15:24 ` David Miller
2008-07-21 18:18 ` Ian Schram
2008-07-21 19:06 ` Ingo Molnar
2008-07-21 19:13 ` Larry Finger
2008-07-21 19:13 ` Larry Finger
2008-07-21 19:34 ` Ingo Molnar
2008-07-21 19:34 ` Ingo Molnar
2008-07-21 19:43 ` Larry Finger
2008-07-21 19:43 ` Larry Finger
2008-07-21 19:47 ` Linus Torvalds
2008-07-21 19:47 ` Linus Torvalds
2008-07-21 20:15 ` David Miller
2008-07-21 20:28 ` Larry Finger
2008-07-21 20:28 ` Larry Finger
2008-07-21 20:21 ` David Miller
2008-07-21 20:21 ` David Miller
2008-07-21 20:38 ` Larry Finger
2008-07-21 20:38 ` Larry Finger
2008-07-21 20:46 ` David Miller
2008-07-21 20:51 ` Patrick McHardy
2008-07-21 21:01 ` David Miller
2008-07-21 21:06 ` Patrick McHardy
2008-07-21 21:35 ` Patrick McHardy
2008-07-21 21:35 ` Patrick McHardy
2008-07-21 21:42 ` Patrick McHardy
2008-07-21 21:42 ` Patrick McHardy
2008-07-21 21:51 ` Larry Finger
2008-07-21 21:51 ` Larry Finger
2008-07-21 22:04 ` Patrick McHardy
2008-07-21 22:04 ` Patrick McHardy
2008-07-21 22:40 ` Larry Finger
2008-07-21 22:40 ` Larry Finger
2008-07-21 23:15 ` David Miller
2008-07-21 23:15 ` David Miller
2008-07-22 6:34 ` Larry Finger
2008-07-22 10:51 ` Jarek Poplawski
2008-07-22 10:51 ` Jarek Poplawski
2008-07-22 11:32 ` David Miller
2008-07-22 12:52 ` Larry Finger
2008-07-22 20:43 ` David Miller
2008-07-22 13:02 ` Larry Finger
2008-07-22 14:53 ` Patrick McHardy
2008-07-22 14:53 ` Patrick McHardy
2008-07-22 21:17 ` David Miller
2008-07-22 21:17 ` David Miller
2008-07-22 16:39 ` Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98() Larry Finger
2008-07-22 16:39 ` Larry Finger
2008-07-22 17:20 ` Patrick McHardy
2008-07-22 17:20 ` Patrick McHardy
2008-07-22 18:39 ` Larry Finger
2008-07-22 18:44 ` Patrick McHardy
2008-07-22 19:30 ` Larry Finger
2008-07-22 19:30 ` Larry Finger
2008-07-22 23:04 ` David Miller
2008-07-23 6:20 ` Jarek Poplawski
2008-07-23 7:59 ` David Miller
2008-07-23 8:54 ` Jarek Poplawski
2008-07-23 8:54 ` Jarek Poplawski
2008-07-23 9:03 ` Peter Zijlstra
2008-07-23 9:03 ` Peter Zijlstra
2008-07-23 9:35 ` Jarek Poplawski
2008-07-23 9:35 ` Jarek Poplawski
2008-07-23 9:50 ` Peter Zijlstra
2008-07-23 9:50 ` Peter Zijlstra
2008-07-23 10:13 ` Jarek Poplawski
2008-07-23 10:13 ` Jarek Poplawski
2008-07-23 10:58 ` Peter Zijlstra
2008-07-23 11:35 ` Jarek Poplawski
2008-07-23 11:35 ` Jarek Poplawski
2008-07-23 11:49 ` Jarek Poplawski
2008-07-23 11:49 ` Jarek Poplawski
2008-07-23 20:16 ` David Miller
2008-07-23 20:43 ` Jarek Poplawski
2008-07-23 20:55 ` David Miller
2008-07-23 20:55 ` David Miller
2008-07-24 9:10 ` Peter Zijlstra
2008-07-24 9:10 ` Peter Zijlstra
2008-07-24 9:20 ` David Miller
2008-07-24 9:20 ` David Miller
2008-07-24 9:27 ` Peter Zijlstra
2008-07-24 9:27 ` Peter Zijlstra
2008-07-24 9:32 ` David Miller
2008-07-24 10:08 ` Peter Zijlstra [this message]
2008-07-24 10:08 ` Peter Zijlstra
2008-07-24 10:38 ` Nick Piggin
2008-07-24 10:55 ` Miklos Szeredi
2008-07-24 10:55 ` Miklos Szeredi
2008-07-24 11:06 ` Nick Piggin
2008-07-24 11:06 ` Nick Piggin
2008-08-01 21:10 ` Paul E. McKenney
2008-08-01 21:10 ` Paul E. McKenney
2008-07-24 10:59 ` Peter Zijlstra
2008-07-24 10:59 ` Peter Zijlstra
2008-08-01 21:10 ` Paul E. McKenney
2008-07-23 20:14 ` David Miller
2008-07-23 20:14 ` David Miller
2008-07-24 7:00 ` Peter Zijlstra
2008-07-24 7:00 ` Peter Zijlstra
2008-07-25 17:04 ` Ingo Oeser
2008-07-25 18:36 ` Jarek Poplawski
2008-07-25 18:36 ` Jarek Poplawski
2008-07-25 19:16 ` Johannes Berg
2008-07-25 19:34 ` Jarek Poplawski
2008-07-25 19:34 ` Jarek Poplawski
2008-07-25 19:36 ` Johannes Berg
2008-07-25 20:01 ` Jarek Poplawski
2008-07-26 9:18 ` David Miller
2008-07-26 9:18 ` David Miller
2008-07-26 10:53 ` Jarek Poplawski
2008-07-26 13:18 ` Jarek Poplawski
2008-07-26 13:18 ` Jarek Poplawski
2008-07-27 0:34 ` David Miller
2008-07-27 0:34 ` David Miller
2008-07-27 20:37 ` Jarek Poplawski
2008-07-27 20:37 ` Jarek Poplawski
2008-07-31 12:29 ` David Miller
2008-07-31 12:29 ` David Miller
2008-07-31 12:38 ` Nick Piggin
2008-07-31 12:38 ` Nick Piggin
2008-07-31 12:44 ` David Miller
2008-08-01 4:27 ` David Miller
2008-08-01 7:09 ` Peter Zijlstra
2008-08-01 7:09 ` Peter Zijlstra
2008-08-01 6:48 ` Jarek Poplawski
2008-08-01 7:00 ` David Miller
2008-08-01 7:00 ` David Miller
2008-08-01 7:01 ` Jarek Poplawski
2008-08-01 7:01 ` David Miller
2008-08-01 7:01 ` David Miller
2008-08-01 7:41 ` Jarek Poplawski
2008-07-25 6:20 ` [lockdep warning] AOE / networking: aoenet_xmit: noop_qdisc.q.lock, INFO: inconsistent lock state at 0000000000000370 Ingo Molnar
2008-07-25 6:25 ` David Miller
2008-07-25 7:26 ` Ingo Molnar
2008-07-25 8:23 ` David Miller
2008-07-21 15:10 ` [crash] BUG: unable to handle kernel NULL pointer dereference " David Miller
2008-07-21 15:10 ` David Miller
2008-07-21 15:10 ` David Miller
2008-07-21 18:23 ` [crash] kernel BUG at net/core/dev.c:1328! Ingo Molnar
2008-07-21 18:35 ` Linus Torvalds
2008-07-21 18:46 ` Ingo Molnar
2008-07-21 19:30 ` Ingo Molnar
2008-07-22 11:21 ` [TCP bug] stuck distcc connections in latest -git Ingo Molnar
2008-07-22 13:45 ` David Newall
2008-07-22 13:57 ` Ingo Molnar
2008-07-22 14:54 ` David Newall
2008-07-22 15:34 ` Ingo Molnar
2008-07-22 21:12 ` Willy Tarreau
2008-07-23 8:26 ` Ingo Molnar
2008-07-24 6:04 ` [TCP bug, regression] " Ingo Molnar
2008-07-24 6:32 ` Ingo Molnar
2008-07-24 7:33 ` Willy Tarreau
2008-07-24 8:35 ` Ingo Molnar
2008-07-24 7:53 ` Herbert Xu
2008-07-24 8:24 ` Willy Tarreau
2008-07-24 8:27 ` Ingo Molnar
2008-07-24 8:36 ` David Miller
2008-07-24 9:05 ` Herbert Xu
2008-07-24 9:22 ` David Miller
2008-07-24 9:34 ` Ingo Molnar
2008-07-24 11:56 ` [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference Ingo Molnar
2008-07-24 11:59 ` Ingo Molnar
2008-07-24 12:03 ` Patrick McHardy
2008-07-24 12:22 ` Herbert Xu
2008-07-24 12:40 ` Pekka Enberg
2008-07-24 12:50 ` Herbert Xu
2008-07-24 12:56 ` Nick Piggin
2008-07-24 13:04 ` Herbert Xu
2008-07-24 13:13 ` Nick Piggin
2008-07-24 13:32 ` Pekka Enberg
2008-07-24 19:21 ` Matt Mackall
2008-07-25 9:09 ` Nick Piggin
2008-07-24 13:11 ` Matt Mackall
2008-07-24 14:37 ` Herbert Xu
2008-07-24 17:47 ` Matt Mackall
2008-07-25 1:39 ` Herbert Xu
2008-07-25 2:59 ` Matt Mackall
2008-07-24 12:44 ` Pekka Enberg
2008-07-24 12:49 ` Patrick McHardy
2008-07-24 13:23 ` Pekka Enberg
2008-07-24 13:31 ` Patrick McHardy
2008-07-24 13:34 ` Pekka Enberg
2008-07-24 18:51 ` Andrew Morton
2008-07-24 18:55 ` Pekka Enberg
2008-07-24 20:58 ` David Miller
2008-07-25 8:02 ` Dieter Ries
2008-07-25 10:41 ` Pekka Enberg
2008-07-24 19:35 ` Ingo Molnar
2008-07-26 16:09 ` Patrick McHardy
2008-07-26 17:34 ` Ingo Molnar
2008-07-26 13:43 ` Patrick McHardy
2008-07-24 21:13 ` Linus Torvalds
2008-07-24 22:09 ` David Miller
2008-07-26 13:47 ` Patrick McHardy
2008-08-01 21:10 ` Paul E. McKenney
2008-07-24 14:23 ` Ingo Molnar
2008-07-24 15:23 ` Patrick McHardy
2008-07-24 15:32 ` Ingo Molnar
2008-07-24 15:34 ` Patrick McHardy
2008-07-24 18:00 ` Krzysztof Oledzki
2008-07-24 13:01 ` [TCP bug, regression] stuck distcc connections in latest -git Willy Tarreau
2008-07-24 9:25 ` Ingo Molnar
2008-07-24 9:29 ` David Miller
2008-07-24 11:12 ` Herbert Xu
2008-07-24 9:36 ` Ilpo Järvinen
2008-07-24 10:03 ` Ilpo Järvinen
2008-07-21 19:00 ` [crash] kernel BUG at net/core/dev.c:1328! David Miller
2008-07-21 19:20 ` Stefan Richter
2008-07-21 20:11 ` David Miller
2008-07-21 21:26 ` Stefan Richter
2008-07-21 19:44 ` Ingo Molnar
2008-07-21 20:20 ` David Miller
2008-07-21 15:07 ` [crash, bisected] Kernel BUG at ffffffff8079afb1 (__netif_schedule()) David Miller
2008-07-21 13:50 ` [GIT]: Networking Ingo Molnar
2008-07-21 14:15 ` Stefan Richter
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