linux-kernel - Re: RFC: issues concerning the next NAPI interface

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Message-ID: <20070824215103.GO4282@austin.ibm.com>
Date:	Fri, 24 Aug 2007 16:51:03 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	David Miller <davem@...emloft.net>
Cc:	dlstevens@...ibm.com, tklein@...ibm.com, themann@...ibm.com,
	stefan.roscher@...ibm.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, raisch@...ibm.com,
	netdev-owner@...r.kernel.org, linuxppc-dev@...abs.org,
	akepner@....com, meder@...ibm.com, ossthema@...ibm.com,
	shemminger@...ux-foundation.org
Subject: Re: RFC: issues concerning the next NAPI interface

On Fri, Aug 24, 2007 at 02:44:36PM -0700, David Miller wrote:
> From: David Stevens <dlstevens@...ibm.com>
> Date: Fri, 24 Aug 2007 09:50:58 -0700
> 
> >         Problem is if it increases rapidly, you may drop packets
> > before you notice that the ring is full in the current estimated
> > interval.
> 
> This is one of many reasons why hardware interrupt mitigation
> is really needed for this.

When turning off interrupts, don't turn them *all* off.
Leave the queue-full interrupt always on.

--linas
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