Date: Mon, 4 May 2009 23:59:52 -0600 From: Tim Judd <tajudd@gmail.com> To: Duane <duane@cheekymonkey.us> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: Part II: Running SMP kernel but only one cpu Message-ID: <ade45ae90905042259m79be0f5ck7d2f5182c648c589@mail.gmail.com> In-Reply-To: <5e8ad96d0905042249p670eefeakf61d578bf09e373@mail.gmail.com> References: <5e8ad96d0905041746o67c463e9t1297a0b3103557bf@mail.gmail.com> <ade45ae90905042045i7b27d289h5088d60daecd53da@mail.gmail.com> <5e8ad96d0905042249p670eefeakf61d578bf09e373@mail.gmail.com>
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On Mon, May 4, 2009 at 11:49 PM, Duane <duane@cheekymonkey.us> wrote: > On 5/4/09, Tim Judd <tajudd@gmail.com> 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
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