netdev - Re: 3.2.8/amd64 full interrupt hangs and deadlocks under big network copies (page allocation failure)

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Message-Id: <20120409.153452.1284163346306246866.davem@davemloft.net>
Date:	Mon, 09 Apr 2012 15:34:52 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	Larry.Finger@...inger.net, marc@...lins.org,
	bhutchings@...arflare.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: 3.2.8/amd64 full interrupt hangs and deadlocks under big
 network copies (page allocation failure)

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 09 Apr 2012 21:11:12 +0200

> I think Marc posted stack traces showing problem on transmit side.
 ...
> I dont really understand how it can happen, with MTU=1500

Depending upon the configuration and the driver, wireless can need
more headroom.  For encryption an extra 8 bytes are necessary, and the
driver may request a variable amount of extra headroom via
->hw.extra_tx_headroom

What wireless device are we dealing with again?
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