From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH net] bna: page allocation during interrupts to use a
 mempool.
Date: Wed, 08 Oct 2014 12:04:52 -0700
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Cc: Shahed Shaikh <shahed.shaikh@qlogic.com>,
	Stephen Hemminger <stephen@networkplumber.org>,
	netdev <netdev@vger.kernel.org>,
	Rasesh Mody <rasesh.mody@qlogic.com>
To: Eric Wheeler <netdev@lists.ewheeler.net>
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On Wed, 2014-10-08 at 12:01 -0700, Eric Wheeler wrote:
> On Tue, 7 Oct 2014, Eric Dumazet wrote:
> 
> > On Tue, 2014-10-07 at 17:48 -0700, Eric Wheeler wrote:
> >
> >> Just += unmap->vector.len still did not work (same backtrace), so I've
> >> rebuilt with PAGE_SIZE<<2 and so far so good.  I'll let it run all night
> >> and see if we get any problems.
> >
> > Further inspection of the driver told me that unmap->vector.len should
> > be 16384 already. (same than PAGE_SIZE << 2)
> > (set at line 304, drivers/net/ethernet/brocade/bna/bnad.c)
> >
> > So you might hit memory fragmentation issues.
> >
> > Do you have CONFIG_COMPACTION=y in your .config ?
> 
> We're still having the backtrace.

What is the output of 

free
cat /proc/sys/vm/min_free_kbytes
cat /proc/buddyinfo