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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: David griego <dagriego@hotmail.com>,
	alan@storlinksemi.com,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Alan Shih: "TCP IP Offloading Interface"
Date: 14 Jul 2003 21:23:09 +0100	[thread overview]
Message-ID: <1058214188.606.139.camel@dhcp22.swansea.linux.org.uk> (raw)
In-Reply-To: <3F130C75.3010603@pobox.com>

On Llu, 2003-07-14 at 21:03, Jeff Garzik wrote:
> 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.

There isnt currently any evidence it buy you anything, although HT may
change that equation a bit. Its still the same RAM bandwidth and you've
not really gotten rid of most of the socket handling/event/wakeup
overhead either.


  reply	other threads:[~2003-07-14 20:23 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-14 19:43 Alan Shih: "TCP IP Offloading Interface" David griego
2003-07-14 20:03 ` Jeff Garzik
2003-07-14 20:23   ` Alan Cox [this message]
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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