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

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Message-ID: <46CF1069.7090406@hp.com>
Date:	Fri, 24 Aug 2007 10:07:53 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Linas Vepstas <linas@...tin.ibm.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Jan-Bernd Themann <ossthema@...ibm.com>,
	Thomas Klein <tklein@...ibm.com>, Marcus@...abs.org,
	Jan-Bernd Themann <themann@...ibm.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Raisch <raisch@...ibm.com>,
	linux-ppc <linuxppc-dev@...abs.org>, akepner@....com,
	Eder <meder@...ibm.com>,
	Stefan Roscher <stefan.roscher@...ibm.com>
Subject: Re: RFC: issues concerning the next NAPI interface

> Just to be clear, in the previous email I posted on this thread, I
> described a worst-case network ping-pong test case (send a packet, wait
> for reply), and found out that a deffered interrupt scheme just damaged
> the performance of the test case.  Since the folks who came up with the
> test case were adamant, I turned off the defferred interrupts.  
> While defferred interrupts are an "obvious" solution, I decided that 
> they weren't a good solution. (And I have no other solution to offer).

Sounds exactly like the default netperf TCP_RR test and any number of other 
benchmarks.  The "send  a request, wait for reply, send next request, etc etc 
etc" is a rather common application behaviour afterall.

rick jones
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