From: Vernon Mauery <vernux@us.ibm.com>
To: David Miller <davem@davemloft.net>
Cc: andi@firstfloor.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Subject: Re: High contention on the sk_buff_head.lock
Date: Wed, 18 Mar 2009 14:10:33 -0700 [thread overview]
Message-ID: <49C16349.9030503@us.ibm.com> (raw)
In-Reply-To: <20090318.140340.55290859.davem@davemloft.net>
David Miller wrote:
> From: Andi Kleen <andi@firstfloor.org>
> Date: Wed, 18 Mar 2009 21:54:37 +0100
>
>> But then again I'm not sure it's worth it if the problem only
>> happens in out of tree RT.
>
> The list of problems that only show up with the RT kernel seems to be
> constantly increasing, but honestly is very surprising to me.
>
> I don't understand why we even need to be concerned about this stuff
> upstream, to be honest.
>
> Please reproduce this in the vanilla kernel, then get back to us.
Huh? The numbers that I posted *were* from the vanilla kernel. I ran
the 2.6.29-rc8 kernel with lock_stat enabled. The lock contention
happens on the same lock in both vanilla and -rt, it just happens
to be more pronounced in the -rt kernel because of the double context
switches that the sleeping spinlock/rt-mutexes introduce.
--Vernon
next prev parent reply other threads:[~2009-03-18 21:10 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-18 17:24 High contention on the sk_buff_head.lock Vernon Mauery
2009-03-18 19:07 ` Eric Dumazet
2009-03-18 20:17 ` Vernon Mauery
2009-03-20 23:29 ` Jarek Poplawski
2009-03-23 8:32 ` Eric Dumazet
2009-03-23 8:32 ` Eric Dumazet
2009-03-23 8:37 ` David Miller
2009-03-23 8:50 ` Jarek Poplawski
2009-04-02 14:13 ` Herbert Xu
2009-04-02 14:15 ` Herbert Xu
2009-03-18 20:54 ` Andi Kleen
2009-03-18 21:03 ` David Miller
2009-03-18 21:10 ` Vernon Mauery [this message]
2009-03-18 21:38 ` David Miller
2009-03-18 21:49 ` Vernon Mauery
2009-03-19 1:02 ` David Miller
2009-03-18 21:54 ` Gregory Haskins
2009-03-19 1:03 ` David Miller
2009-03-19 1:13 ` Sven-Thorsten Dietrich
2009-03-19 1:17 ` David Miller
2009-03-19 1:43 ` Sven-Thorsten Dietrich
2009-03-19 1:54 ` David Miller
2009-03-19 5:49 ` Eric Dumazet
2009-03-19 5:49 ` Eric Dumazet
2009-03-19 5:58 ` David Miller
2009-03-19 14:04 ` [PATCH] net: reorder struct Qdisc for better SMP performance Eric Dumazet
2009-03-19 14:04 ` Eric Dumazet
2009-03-20 8:33 ` David Miller
2009-03-19 13:45 ` High contention on the sk_buff_head.lock Andi Kleen
2009-03-19 3:48 ` Gregory Haskins
2009-03-19 5:38 ` David Miller
2009-03-19 12:42 ` Gregory Haskins
2009-03-19 20:52 ` David Miller
2009-03-19 12:50 ` Peter W. Morreale
2009-03-19 7:15 ` Evgeniy Polyakov
2009-03-18 21:07 ` Vernon Mauery
2009-03-18 21:45 ` Eilon Greenstein
2009-03-18 21:51 ` Vernon Mauery
2009-03-18 21:59 ` Andi Kleen
2009-03-18 22:19 ` Rick Jones
2009-03-19 12:59 ` Peter W. Morreale
2009-03-19 13:36 ` Peter W. Morreale
2009-03-19 13:46 ` Andi Kleen
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