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From: "Peter T. Breuer" <ptb@it.uc3m.es>
To: ptb@it.uc3m.es
Cc: Oliver Xymoron <oxymoron@waste.org>,
	"chen, xiangping" <chen_xiangping@emc.com>,
	"'Jes Sorensen'" <jes@wildopensource.com>,
	"'Steve Whitehouse'" <Steve@ChyGwyn.com>,
	linux-kernel@vger.kernel.org
Subject: Re: Kernel deadlock using nbd over acenic driver.
Date: Thu, 16 May 2002 07:19:43 +0200 (MET DST)	[thread overview]
Message-ID: <200205160519.g4G5JhL29381@oboe.it.uc3m.es> (raw)
In-Reply-To: <200205160510.g4G5AAL28972@oboe.it.uc3m.es> from "Peter T. Breuer" at "May 16, 2002 07:10:10 am"

"Oliver Xymoron wrote:"
> If the system runs out of memory, it may try to flush pages that are
> queued to your NBD device. That will try to allocate more memory for
> sending packets, which will fail, meaning the VM can never make progress
> freeing pages. Now your box is dead.

The system can avoid this by

 a) not flushing sync  (i.e. giving up on pages that won't flush immediately)
 b) being nondeterministic about it .. not always retrying the same
    thing again and again.

Can one achieve those characteristics? I suspect setting the vm
sync boundary to 100% should arrange for (a)?

Peter

  reply	other threads:[~2002-05-16  5:19 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-05-14 16:07 Kernel deadlock using nbd over acenic driver chen, xiangping
2002-05-14 16:32 ` Steven Whitehouse
2002-05-14 16:48 ` Alan Cox
2002-05-15 22:31 ` Oliver Xymoron
2002-05-16  5:10   ` Peter T. Breuer
2002-05-16  5:19     ` Peter T. Breuer [this message]
2002-05-16 14:29       ` Oliver Xymoron
2002-05-16 15:35         ` Peter T. Breuer
2002-05-16 16:22           ` Oliver Xymoron
2002-05-16 16:45             ` Peter T. Breuer
2002-05-16 16:35               ` Steven Whitehouse
2002-05-17  7:01                 ` Peter T. Breuer
2002-05-17  9:26                   ` Steven Whitehouse
  -- strict thread matches above, loose matches on Subject: below --
2002-05-16 22:54 Peter T. Breuer
2002-05-17  8:44 ` Steven Whitehouse
2002-05-23 13:21   ` Peter T. Breuer
2002-05-24 10:11     ` Steven Whitehouse
2002-05-24 11:43       ` Peter T. Breuer
2002-05-24 13:28         ` Steven Whitehouse
2002-05-24 15:54           ` Peter T. Breuer
2002-05-27 13:04             ` Steven Whitehouse
2002-05-27 19:51               ` Peter T. Breuer
2002-05-27 13:44         ` Pavel Machek
2002-05-29 10:51           ` Peter T. Breuer
2002-05-29 11:21             ` Pavel Machek
2002-05-29 12:10               ` Peter T. Breuer
2002-05-29 13:24                 ` Jens Axboe
2002-06-01 21:13       ` Peter T. Breuer
2002-06-05  8:48         ` Steven Whitehouse
2002-06-02  6:39           ` Pavel Machek
     [not found] <3CE40A77.22C74DC1@zip.com.au>
2002-05-16 20:28 ` Peter T. Breuer
2002-05-16 13:18 chen, xiangping
2002-05-15 21:43 Peter T. Breuer
2002-05-16  8:33 ` Steven Whitehouse
2002-05-15 17:43 Peter T. Breuer
2002-05-15 19:43 ` Steven Whitehouse
2002-05-16  5:15   ` Peter T. Breuer
2002-05-16  8:04     ` Steven Whitehouse
2002-05-16  8:49       ` Peter T. Breuer
2002-05-15 16:01 Peter T. Breuer
2002-05-14 17:42 chen, xiangping
2002-05-14 17:36 chen, xiangping
2002-05-14 18:02 ` Alan Cox
2002-05-14 15:05 chen, xiangping
2002-05-14 15:11 ` Jes Sorensen
2002-05-10 15:39 chen, xiangping
2002-05-10 15:02 chen, xiangping
2002-05-10 15:11 ` Steven Whitehouse
2002-05-14 14:58 ` Jes Sorensen
2002-05-06 15:05 chen, xiangping
2002-05-07  8:15 ` Steven Whitehouse
2002-05-06  2:26 chen, xiangping
2002-05-06  8:45 ` Steven Whitehouse

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