netdev - Re: kernel 3.1.1 message: <IRQ> warn_alloc

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Message-Id: <6.2.5.6.2.20111209130007.039b3078@binnacle.cx>
Date:	Fri, 09 Dec 2011 13:03:54 -0500
From:	starlight@...nacle.cx
To:	Stephen Hemminger <shemminger@...tta.com>,
	Sony Chacko <sony.chacko@...gic.com>,
	Rajesh Borundia <rajesh.borundia@...gic.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: kernel 3.1.1 message:  <IRQ> warn_alloc_failed

At 09:50 AM 12/9/2011 -0800, Stephen Hemminger wrote:
>On Thu, 08 Dec 2011 21:10:02 -0500 starlight@...nacle.cx wrote:
>
>You are seeing memory allocation failures because device
>is allocating a 16K (order 2) size socket buffer. You are using
>netxen device, and it looks like the problem.
>
>>From reading the netxen driver source. The LRO buffers
>in this device are very large (8060+skb overhead).
>Until the driver is fixed to use fragmented page size memory,
>I recommend turning off LRO.

Thank you for the analysis.  As an alternative
would it make sense to double or quadruple

    /proc/sys/vm/min_free_kbytes

or perhaps do the same for

    /proc/slabinfo(size-16384)

or both?

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