From owner-freebsd-hackers@FreeBSD.ORG Wed Aug 19 07:08:14 2009 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9ADA6106568C for ; Wed, 19 Aug 2009 07:08:14 +0000 (UTC) (envelope-from zbeeble@gmail.com) Received: from mail-bw0-f206.google.com (mail-bw0-f206.google.com [209.85.218.206]) by mx1.freebsd.org (Postfix) with ESMTP id 239C68FC55 for ; Wed, 19 Aug 2009 07:08:13 +0000 (UTC) Received: by bwz2 with SMTP id 2so3264030bwz.43 for ; Wed, 19 Aug 2009 00:08:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=/P4No3b5iXmCixciVw9DcPzvt3RztAVixidlH3Zlmwo=; b=pDXVGVBDz/ytwjQg5iExxNVasTnq1Kbl5lZEn3QZag9gsf8t82HYSGmnvpn90+QU+C w2EkRRq93jT4yNx3DXSgEk8sFva+zDkgj17G11KCFqni6Tw6S4M82boZthRNPwtYVfTa hKmM6JgEmP5/Glynx+BT0uwQ2o2fwnxeS4Wu4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=Yv8CtpowYUXVVGCLqRIiPa2vSjUWsaOAkk3JDDCiaxRyJZ0TigspMMO+SMYp03pnBq QNdm+cO6hB4FjsHvg0jeoR5NRbSfuBQ7gO8/7ULXQjmbL0g09642b+0aaJ7j3HgQgkNu DLPajBHGNGWpUds+aY2o6U8+sZBOm3c/m9xMg= MIME-Version: 1.0 Received: by 10.216.8.78 with SMTP id 56mr1539507weq.210.1250663734574; Tue, 18 Aug 2009 23:35:34 -0700 (PDT) In-Reply-To: <200908191253.27951.doconnor@gsoft.com.au> References: <200908191253.27951.doconnor@gsoft.com.au> Date: Wed, 19 Aug 2009 02:35:34 -0400 Message-ID: <5f67a8c40908182335y59679131u373e8a3b27856909@mail.gmail.com> From: Zaphod Beeblebrox To: "Daniel O'Connor" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-hackers@freebsd.org Subject: Re: PCI IRQ latency X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Aug 2009 07:08:14 -0000 On Tue, Aug 18, 2009 at 11:23 PM, Daniel O'Connor wrote: > Unfortunately it seems that _something_ blocks interrupts for >4 > milliseconds, however I have no real idea how to go about finding what > it is.. Does anyone have any suggestions? (apart from get a new DAQ > card, I know this one already :) This is a huge shot-in-the-dark, but could this be something like ACPI or some other motherboard legacy cpu-using evil? Would it be possible to test on something opposite-ish of what you're using (ie: amd vs. intel) just to cycle out all the potential goo?