Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268336AbUIBUQq (ORCPT ); Thu, 2 Sep 2004 16:16:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268415AbUIBUON (ORCPT ); Thu, 2 Sep 2004 16:14:13 -0400 Received: from pegasus.allegientsystems.com ([208.251.178.236]:46603 "EHLO pegasus.lawaudit.com") by vger.kernel.org with ESMTP id S268929AbUIBUNp (ORCPT ); Thu, 2 Sep 2004 16:13:45 -0400 Message-ID: <41377EF6.4010902@optonline.net> Date: Thu, 02 Sep 2004 16:13:42 -0400 From: Nathan Bryant User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040806 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Chris Wedgwood CC: William Lee Irwin III , LKML , Linus Torvalds Subject: Re: [PATCH] i386 reduce spurious interrupt noise References: <20040902192820.GA6427@taniwha.stupidest.org> <20040902193454.GI5492@holomorphy.com> <20040902194739.GA6673@taniwha.stupidest.org> In-Reply-To: <20040902194739.GA6673@taniwha.stupidest.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1669 Lines: 44 Chris Wedgwood wrote: > On Thu, Sep 02, 2004 at 12:34:54PM -0700, William Lee Irwin III wrote: > > >>Please check printk_ratelimit(). > > > I don't want them displayed by default at *all* --- it wakes up the > monitor on console machines and that's annoying. > > You get about 1 or 2 a day --- rate limiting isn't useful, nor is > reporting them IMO. Right, spurious interrupts aren't a big deal on i386. They happen now and then with some devices because some hardware timing tolerances are a little too tight. See for example sections 5.7.1.3/5.7.4 of the intel 850 chipset databook (http://developer.intel.com/design/chipsets/datashts/29068702.pdf) : "6. Upon receiving the second internally generated INTA# pulse, the PIC returns the interrupt vector. If no interrupt request is present because the request was too short in duration, the PIC will return vector 7 from the master controller." "In both the edge-triggered and level-triggered modes, the IRQ inputs must remain active until after the falling edge of the first internal INTA#. If the IRQ input goes inactive before this time, a default IRQ7 vector will be returned." > > > --cw > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/