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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next 2/3] mlx4_en: moderate frequency of TX
 completions
Date: Thu, 23 Feb 2012 16:47:56 -0500 (EST)
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From: Ben Hutchings <bhutchings@solarflare.com>
Date: Thu, 23 Feb 2012 21:26:20 +0000

> And it's pretty obvious the hardware has to also send a completion when
> the queue is empty.  I hope.

Right and we know of several chips that don't.