netdev - Re: [net-2.6 PATCH 3/3] ixgbe: Fix RSC completion delay causing Rx interrupts to stop

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Date:	Thu, 30 Jul 2009 19:29:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com,
	peter.p.waskiewicz.jr@...el.com
Subject: Re: [net-2.6 PATCH 3/3] ixgbe: Fix RSC completion delay causing Rx
 interrupts to stop

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Thu, 30 Jul 2009 15:26:00 -0700

> When a user disables interrupt throttling with ethtool on 82599 devices,
> the interrupt timer may not be re-enabled if hardware RSC is running.  The
> RSC completions in hardware don't complete before the next ITR event tries
> to fire, so the ITR timer never gets re-armed.  This patch increases the
> amount of time between interrupts when throttling is disabled (rx-usecs =
> 0) when the hardware RSC deature is enabled.
> 
> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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