netdev - Re: 3.7.8/amd64 full interrupt hangs due to iwlwifi under big nfs copies out

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Message-ID: <20130219052639.GA21764@merlins.org>
Date:	Mon, 18 Feb 2013 21:26:39 -0800
From:	Marc MERLIN <marc@...lins.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, Larry.Finger@...inger.net,
	bhutchings@...arflare.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: 3.7.8/amd64 full interrupt hangs due to iwlwifi under big nfs copies out

On Mon, Feb 18, 2013 at 09:17:13PM -0800, Eric Dumazet wrote:
> > chrome: page allocation failure: order:1, mode:0x4020
> > Pid: 8730, comm: chrome Tainted: G           O 3.7.8-amd64-preempt-20121226-fixwd #1
> > Call Trace:
> >  <IRQ>  [<ffffffff810d5f38>] warn_alloc_failed+0x117/0x12c
> >  [<ffffffff810d8cfd>] __alloc_pages_nodemask+0x66a/0x702
> >  [<ffffffff8108a948>] ? arch_local_irq_save+0x15/0x1b
> >  [<ffffffff811064af>] alloc_pages_current+0xcd/0xee
> >  [<ffffffffa039b579>] iwl_rx_allocate+0x8c/0x271 [iwlwifi]
> >  [<ffffffffa039c24e>] iwl_irq_tasklet+0x7e5/0x91c [iwlwifi]
> >  [<ffffffff8104805e>] tasklet_action+0x80/0xd2
> >  [<ffffffff81047c99>] __do_softirq+0xdf/0x1c5
> >  [<ffffffff814c1ed6>] ? _raw_spin_lock+0x1b/0x1f
> >  [<ffffffff810a7f37>] ? handle_irq_event+0x4d/0x62
> >  [<ffffffff814c7f5c>] call_softirq+0x1c/0x30
> >  [<ffffffff8101104e>] do_softirq+0x41/0x7f
> >  [<ffffffff81047e52>] irq_exit+0x3f/0xa7
> >  [<ffffffff81010d40>] do_IRQ+0x88/0x9f
> >  [<ffffffff814c246d>] common_interrupt+0x6d/0x6d
> >  <EOI> Mem-Info:
> 
> You could try to load iwlwifi with amsdu_size_8K set to 0 (disable)
> 
> It should hopefully use order-0 pages
> 
> Some drivers cant fallback to low order page allocations.
> 
> mlx4 is another example (it uses order-2 pages )

Well, now that I changed NFS to 32K buffering, I won't have the problem
anyway, so the problem is effectively fixed enough for me.
But because the default behaviour is so bad, I wanted to help fix the
defaults so that it doesn't happen to others if possible.

I haven't been following the NFS world recently, so I don't know if the code
is known broken beyond fixing, or if I did find an unusual problem that is
worth looking into.

If somehow I'm the only one, then let's not worry about it :)

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/  
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