netdev - Re: [net-next-2.6 PATCH 1/2] ixgbe: enable extremely low latency

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Date:	Tue, 27 Apr 2010 12:56:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com,
	jesse.brandeburg@...el.com
Subject: Re: [net-next-2.6 PATCH 1/2] ixgbe: enable extremely low latency

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Tue, 27 Apr 2010 04:37:20 -0700

> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> 
> 82598/82599 can support EITR == 0, which allows for the
> absolutely lowest latency setting in the hardware.  This disables
> writeback batching and anything else that relies upon a delayed
> interrupt. This patch enables the feature of "override" when a
> user sets rx-usecs to zero, the driver will respect that setting
> over using RSC, and automatically disable RSC.  If rx-usecs is
> used to set the EITR value to 0, then the driver should disable
> LRO (aka RSC) internally until EITR is set to non-zero again.
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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