netdev - Re: [PATCH 20/22] e1000: Fix poor quad port performance with NAPI

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Message-ID: <457D6FE7.9010100@pobox.com>
Date:	Mon, 11 Dec 2006 09:49:11 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
CC:	netdev@...r.kernel.org,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Kok, Auke" <auke@...-projects.org>,
	"Ronciak, John" <john.ronciak@...el.com>
Subject: Re: [PATCH 20/22] e1000: Fix poor quad port performance with NAPI

Kok, Auke wrote:
> This fix attempts to solve a customer reported issue with NAPI enabled
> e1000 having bad performance when transmitting simultaneously on
> four ports.  The issue comes down to an interaction between NAPI
> hardware interrupt balancing, and the driver rescheduling poll on
> the same processor.
> 
> We try to fix by allowing the driver to re-enable interrupts sooner
> instead of polling one more time, when there was recently all the
> work completed in cleanup.
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>

ACK patches 16-20


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