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

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Message-ID: <1361387854.19353.214.camel@edumazet-glaptop>
Date:	Wed, 20 Feb 2013 11:17:34 -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 Wed, 2013-02-20 at 19:16 +0100, Johannes Berg wrote:

> Yes and no. The current code doesn't pull in much data, not even the IP
> header, so worst case it copies 14 bytes (ethernet header) in mac80211
> to obtain alignment. By pulling in everything here, it later has to copy
> everything again later to obtain alignment.

Can you give me pointers to the code doing that ?

On x86 we should not doing anything.



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