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

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Date:	Tue, 13 Dec 2011 19:09:54 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	Rajesh Borundia <rajesh.borundia@...gic.com>,
	"starlight@...nacle.cx" <starlight@...nacle.cx>,
	Sony Chacko <sony.chacko@...gic.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: kernel 3.1.1 message:  <IRQ> warn_alloc_failed

On Tue, 2011-12-13 at 10:41 -0800, Stephen Hemminger wrote:
> On Tue, 13 Dec 2011 11:42:13 -0600
> Rajesh Borundia <rajesh.borundia@...gic.com> wrote:
> 
> > Hi All,
> > 
> > Sorry for late reply.
> > 
> > Stephan,
> > Thanks for analyzing.
> > 
> > Yes, the netxen adapter does not support fragmented page memory.
> > They are not harmful messages. At that instant of time it may fail allocating
> > memory for some buffers in the ring but after enough memory is available
> > it will try to allocate memory for unallocated buffers in ring.
> > 
> > Or the other option could be to turn LRO off.
[...]
> The driver should be changed to call allocation with __GFP_NOWARN.
> Change dev_alloc_skb(size) to
>   __dev_alloc_skb(size, GFP_ATOMIC|__GFP_NOWARN)
> 
> Or better yet, switch to using netdev_alloc variant like
>   __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC|__GFP_NOWARN)

Why should this be done only in specific drivers?

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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