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From: "David S. Miller" <davem@davemloft.net>
To: heiko.carstens@de.ibm.com
Cc: shemminger@osdl.org, jgarzik@pobox.com, akpm@osdl.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	fpavlic@de.ibm.com, davem@sunset.davemloft.net
Subject: Re: [patch] ipv4: initialize arp_tbl rw lock
Date: Sat, 15 Apr 2006 00:34:57 -0700 (PDT)	[thread overview]
Message-ID: <20060415.003457.103031290.davem@davemloft.net> (raw)
In-Reply-To: <20060415072745.GA17011@osiris.boeblingen.de.ibm.com>

From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Sat, 15 Apr 2006 09:27:45 +0200

> Tried to figure out what is causing the delays I experienced when I replaced
> module_init() in af_inet.c with fs_initcall(). After all it turned out that
> synchronize_net() which is basicically nothing else than synchronize_rcu()
> sometimes takes several seconds to complete?! No idea why that is...
> 
> callchain: inet_init() -> inet_register_protosw() -> synchronize_net()

The problem can't be rcu_init(), that gets done very early
in init/main.c

Maybe it's some timer or something else specific to s390?

It could also be that there's perhaps nothing to context
switch to, thus the RCU takes forever to "happen".

  reply	other threads:[~2006-04-15  7:34 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-07  8:15 [patch] ipv4: initialize arp_tbl rw lock Heiko Carstens
2006-04-07 14:46 ` Stephen Hemminger
2006-04-08 10:02   ` Heiko Carstens
2006-04-08 10:12     ` Andrew Morton
2006-04-19 10:45       ` Christian Borntraeger
2006-04-19 20:12         ` David S. Miller
2006-04-20 13:11           ` Heiko Carstens
2006-04-08 10:14     ` David S. Miller
2006-04-08 10:42       ` Heiko Carstens
2006-04-08 12:14       ` Sam Ravnborg
2006-04-15  7:27       ` Heiko Carstens
2006-04-15  7:34         ` David S. Miller [this message]
2006-04-15 23:00           ` Heiko Carstens
2006-04-24 10:18           ` Heiko Carstens
2006-04-24 10:22           ` [patch] ipv4: inet_init() -> fs_initcall Heiko Carstens
2006-04-07 20:14 ` [patch] ipv4: initialize arp_tbl rw lock David S. Miller

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