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From: Dipankar Sarma <dipankar@in.ibm.com>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Jean Delvare <khali@linux-fr.org>,
	torvalds@osdl.org, Serge Belyshev <belyshev@depni.sinp.msu.ru>,
	LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@osdl.org>,
	Manfred Spraul <manfred@colorfullife.com>
Subject: Re: [RCU problem] was VFS: file-max limit 50044 reached
Date: Mon, 17 Oct 2005 19:03:14 +0530	[thread overview]
Message-ID: <20051017133314.GA20784@in.ibm.com> (raw)
In-Reply-To: <4353A6F6.9050205@cosmosbay.com>

On Mon, Oct 17, 2005 at 03:28:22PM +0200, Eric Dumazet wrote:
> Dipankar Sarma a écrit :
> >On Mon, Oct 17, 2005 at 02:10:09PM +0200, Eric Dumazet wrote:
> >
> >
> >Can you try it with rcupdate.maxbatch set to 10000 in boot
> >command line ?
> >
> 
> Changing maxbatch from 10 to 10000 cures the problem.
> Maybe we could initialize maxbatch to (10000000/HZ), considering no current 
> cpu is able to queue more than 10.000.000 items per second in a list.

I don't know, maybe I can look at a more adaptive heuristics.

> 
> 
> >FWIW, the open/close test problem goes away if I set maxbatch to
> >10000. I had introduced this limit some time ago to curtail
> >the effect long running softirq handlers have on scheduling
> >latencies, which now conflicts with OOM avoidance requirements.
> 
> Yes, and probably OOM avoidance has a higher priority than latencies in DOS 
> situations...

Yes, one would think. But the audio guys would chew my head for this :)

Thanks
Dipankar

  reply	other threads:[~2005-10-17 13:39 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-10-15 13:19 VFS: file-max limit 50044 reached Serge Belyshev
2005-10-15 17:53 ` Serge Belyshev
2005-10-16 16:23   ` Dipankar Sarma
2005-10-16 18:51     ` Serge Belyshev
2005-10-16 18:56       ` Dipankar Sarma
2005-10-17  2:19         ` Linus Torvalds
2005-10-17  4:43           ` Serge Belyshev
2005-10-17  8:32           ` Jean Delvare
2005-10-17  8:46             ` Dipankar Sarma
2005-10-17  9:10               ` Eric Dumazet
2005-10-17  9:14                 ` Christoph Hellwig
2005-10-17  9:25                   ` Eric Dumazet
2005-10-17 10:32                 ` Dipankar Sarma
2005-10-17 12:10                   ` [RCU problem] was " Eric Dumazet
2005-10-17 12:31                     ` linux-os (Dick Johnson)
2005-10-17 12:36                     ` Dipankar Sarma
2005-10-17 13:28                       ` Eric Dumazet
2005-10-17 13:33                         ` Dipankar Sarma [this message]
2005-10-17 14:54                         ` Eric Dumazet
2005-10-17 15:42                   ` Linus Torvalds
2005-10-17 16:01                     ` Eric Dumazet
2005-10-17 16:16                       ` Linus Torvalds
2005-10-17 16:29                         ` Dipankar Sarma
2005-10-17 18:01                           ` Eric Dumazet
2005-10-17 18:31                             ` Dipankar Sarma
2005-10-17 19:00                               ` Linus Torvalds
2005-10-17 18:37                             ` Linus Torvalds
2005-10-17 19:12                               ` Eric Dumazet
2005-10-17 19:30                                 ` Linus Torvalds
2005-10-17 19:39                                   ` Eric Dumazet
2005-10-17 20:14                                     ` Linus Torvalds
2005-10-17 20:25                                       ` Christopher Friesen
2005-10-17 20:24                                         ` Dipankar Sarma
2005-10-18 15:55                                           ` Christopher Friesen
2005-10-17 20:38                                         ` Linus Torvalds
2005-10-17 20:33                                       ` Dipankar Sarma
2005-10-17 22:40                                       ` Linus Torvalds
2005-10-17 22:59                             ` Paul E. McKenney
2005-10-18  9:46                               ` Eric Dumazet
2005-10-18 16:22                                 ` Paul E. McKenney
2005-10-17 18:15                           ` Dipankar Sarma
2005-10-17 18:40                           ` Linus Torvalds
2005-10-17 16:23                       ` Dipankar Sarma
2005-10-17 16:31                       ` Lee Revell
2005-10-17 16:20                     ` Dipankar Sarma
2005-10-17  2:34     ` Linus Torvalds
2005-10-17  3:54       ` Roland Dreier
2005-10-17 11:54       ` Dipankar Sarma

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