netdev - irq disable in __netdev_alloc

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Date:	Wed, 22 Oct 2014 17:15:19 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Eric Dumazet <edumazet@...gle.com>,
	Network Development <netdev@...r.kernel.org>
Subject: irq disable in __netdev_alloc_frag() ?

Hi Eric,

in the commit 6f532612cc24 ("net: introduce netdev_alloc_frag()")
you mentioned that the reason to disable interrupts
in __netdev_alloc_frag() is:
"- Must be IRQ safe (non NAPI drivers can use it)"

Is there a way to do this conditionally?

Without it I see 10% performance gain for my RX tests
(from 6.9Mpps to 7.7Mpps) and __netdev_alloc_frag()
itself goes from 6.6% to 2.1%
(popf seems to be quite costly)

Thanks
Alexei
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