From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932124AbWDXXt2 (ORCPT ); Mon, 24 Apr 2006 19:49:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932126AbWDXXt2 (ORCPT ); Mon, 24 Apr 2006 19:49:28 -0400 Received: from shawidc-mo1.cg.shawcable.net ([24.71.223.10]:32077 "EHLO pd5mo1so.prod.shaw.ca") by vger.kernel.org with ESMTP id S932124AbWDXXt1 (ORCPT ); Mon, 24 Apr 2006 19:49:27 -0400 Date: Mon, 24 Apr 2006 17:48:41 -0600 From: Robert Hancock Subject: Re: Van Jacobson's net channels and real-time In-reply-to: <65cJF-66i-11@gated-at.bofh.it> To: linux-kernel Message-id: <444D63D9.8060804@shaw.ca> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit References: <63KcN-6lD-25@gated-at.bofh.it> <64wrg-2cg-41@gated-at.bofh.it> <64wAE-2Cs-9@gated-at.bofh.it> <64AkV-8cG-7@gated-at.bofh.it> <65cqo-5tR-33@gated-at.bofh.it> <65cJF-66i-11@gated-at.bofh.it> User-Agent: Thunderbird 1.5.0.2 (Windows/20060308) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org linux-os (Dick Johnson) wrote: > Message signaled interrupts are just a kudge to save a trace on a > PC board (read make junk cheaper still). They are not faster and > may even be slower. Save a trace on the PC board? How about no, since the devices still need to support INTX interrupts anyway. And yes, they can be faster, mainly because being an in-band signal it simplifies some PCI posting related issues, and there is no need to worry about sharing. > They will not be the salvation of any interrupt > latency problems. The solutions for increasing networking speed, > where the bit-rate on the wire gets close to the bit-rate on the > bus, is to put more and more of the networking code inside the > network board. The CPU get interrupted after most things (like > network handshakes) are complete. You mean like these? http://linux-net.osdl.org/index.php/TOE -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@nospamshaw.ca Home Page: http://www.roberthancock.com/