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

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Date:	Tue, 19 Feb 2013 08:21:49 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Marc MERLIN <marc@...lins.org>, 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 Tue, 2013-02-19 at 11:03 +0100, Johannes Berg wrote:
> On Mon, 2013-02-18 at 21:17 -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
> 
> > You could try to load iwlwifi with amsdu_size_8K set to 0 (disable)
> > 
> > It should hopefully use order-0 pages
> 
> It will, do that then, unfortunately it can't switch at runtime because
> it advertised this support to the access point or clients.

What are the drawbacks of setting amsdu_size_8K to 0 by default ?

Alternative would be :

- As long as we cant allocate order-1 pages (to refill the RX ring),
copy incoming frames into order-0 pages, so that order-1 pages are still
available for the NIC.



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