From owner-freebsd-questions@FreeBSD.ORG Tue May 5 06:00:08 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 792C2106564A for ; Tue, 5 May 2009 06:00:08 +0000 (UTC) (envelope-from tajudd@gmail.com) Received: from qw-out-2122.google.com (qw-out-2122.google.com [74.125.92.25]) by mx1.freebsd.org (Postfix) with ESMTP id 2E7C78FC08 for ; Tue, 5 May 2009 06:00:07 +0000 (UTC) (envelope-from tajudd@gmail.com) Received: by qw-out-2122.google.com with SMTP id 3so3278829qwe.7 for ; Mon, 04 May 2009 23:00:07 -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 :from:date:message-id:subject:to:cc:content-type; bh=9/6DwUNCgoV7oTXOjMdMrBrI1ur86fMOmJVRyx/Er5Q=; b=TjBJhFVH+KrquUxl0/J8x3pxbp6TImdQJu8H9wCEQNth9ufgE9CbFWDs635QZhkFHQ X61sTT8/jsajc0P82ZW8fYs8nGd+jvD+THbofrvxrlNTnu8ULg1LWlheu7qzAP41Y4S7 Jpxv/np9YenQtga9oLYPsZYg1X0SpA5iSm7Z4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; b=I5FaUnaRZ/JD+FehkvoiF/kPL/sOSI+ja9brEwHilgcTuX86e8+LbC9JeS+XOx5wvC sfbDCS3vpr/93S7/iQY8l3fD925MhfzP7tj140A3RhgjNQGKBaexT+eInYsZ/MKKgUaa IStNBjO6v1ZEEgsVaAhhN+46Z3vfqFYOafYpM= MIME-Version: 1.0 Received: by 10.220.87.18 with SMTP id u18mr10847392vcl.102.1241503207218; Mon, 04 May 2009 23:00:07 -0700 (PDT) In-Reply-To: <5e8ad96d0905042249p670eefeakf61d578bf09e373@mail.gmail.com> References: <5e8ad96d0905041746o67c463e9t1297a0b3103557bf@mail.gmail.com> <5e8ad96d0905042249p670eefeakf61d578bf09e373@mail.gmail.com> From: Tim Judd Date: Mon, 4 May 2009 23:59:52 -0600 Message-ID: To: Duane Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-questions Subject: Re: Part II: Running SMP kernel but only one cpu X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 May 2009 06:00:09 -0000 On Mon, May 4, 2009 at 11:49 PM, Duane wrote: > On 5/4/09, Tim Judd wrote: > > > IRQ15 is typically your secondary IDE controller; but due to PCI (or > E-ISA) > > plug&play, including the PnP the BIOS may setup, lots of others can be on > > that bus too. > > This box has one SCSI card running two SCSI drives. The IDE's are > disabled in the BIOS. But the SCSI card does feature in the problem: > > > # grep -i irq15 /var/run/dmesg.boot > > No 'irq15' is found. One can see that the "interrupt storm" begins > when the SCSI drives begin to spin up, IF the machine is booting with > two cpus initialized. dmesg.boot is attached for everyone's > edification and amusement! > > Another interesting datapoint is that if the machine is booted in Safe > Mode the "interrupt storm" disappears, but so does the second cpu. > > > Best regards, > > -- > Duane > I've seen the IRQ storms when an IDE channel is disabled too. And to silence it I had to enable the channel (using an IRQ), with no devices on it. it's gonna be a chatterbox, and the question is if the system can work with a shortage of up to 2 IRQs (irq 14 = primary IDE, irq 15 = secondary IDE) Especially early 586 and 686 classes I saw that often. Would you try enabling the IDE channels and see if the IRQ storms stop? --TJ