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From: Jeff Garzik <jgarzik@pobox.com>
To: David griego <dagriego@hotmail.com>
Cc: alan@storlinksemi.com, linux-kernel@vger.kernel.org
Subject: Re: Alan Shih: "TCP IP Offloading Interface"
Date: Mon, 14 Jul 2003 16:03:01 -0400	[thread overview]
Message-ID: <3F130C75.3010603@pobox.com> (raw)
In-Reply-To: <Sea2-F4kWkKEsEXlwM9000178d9@hotmail.com>

David griego wrote:
> Intel Clusters and Network Storage Volume Platforms Lab reported that it 
> takes about 1MHz to process 1Mbps on a PIII.  Using this rule of thumb 
> (they showed it scaling from 400MHz to 800MHz) it would take 10GHz to 
> process 10Mbps.  Well you might say "what about multi-processers?"  This 

Um.  It doesn't take nearly 10Ghz to handle 10Mbps, or even 100Mbps.


> would be good for people that have multi-processors, but there is a 
> large segment of embedded processors that are not going have SMP, or be 
> at 10GHz anytime soon.  Besides that processing interrupts does not 
> scale across MPs liniarly.  The truth is that communication speeds are 
> outpacing processor speeds at this time.

If the host CPU is a bottleneck after large-send and checksums have been 
offloaded, then logically you aren't getting any work done _anyway_. 
You have to interface with the net stack at some point, in which case 
you incur a fixed cost, for socket handling, TCP exception handling, etc.

Maybe somebody needs to be looking into AMP (asymmetric 
multiprocessing), too.

	Jeff




  reply	other threads:[~2003-07-14 19:49 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-14 19:43 David griego
2003-07-14 20:03 ` Jeff Garzik [this message]
2003-07-14 20:23   ` Alan Cox
2003-07-14 20:05 ` Alan Cox
2003-07-14 20:30   ` Shawn
2003-07-15  5:58   ` Werner Almesberger
     [not found] <Sea2-F66GGORm1u51rM00012573@hotmail.com>
2003-07-15 11:18 ` Alan Cox
  -- strict thread matches above, loose matches on Subject: below --
2003-07-14 21:51 David griego
2003-07-14 20:29 David griego
2003-07-14 20:23 David griego
2003-07-14 20:19 David griego
2003-07-14 20:31 ` Alan Shih
2003-07-14 20:34 ` Alan Cox
2003-07-14 21:53   ` Deepak Saxena
2003-07-17 22:31     ` Bill Davidsen
2003-07-14 19:14 David griego
2003-07-14 19:26 ` Jeff Garzik
2003-07-15 12:42   ` Jesse Pollard
2003-07-14 19:46 ` Alan Cox
2003-07-14 18:46 David griego
2003-07-14 19:02 ` Jeff Garzik
2003-07-14 21:22   ` Deepak Saxena
2003-07-14 21:45     ` Jeff Garzik
2003-07-15  5:27     ` Werner Almesberger
2003-07-14 19:42 ` Alan Cox

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