On Mon, Mar 04, 2013 at 02:04:19PM -0500, Neil Horman wrote: > A few years back intel published a spec update: > http://www.intel.com/content/dam/doc/specification-update/5520-and-5500-chipset-ioh-specification-update.pdf > > For the 5520 and 5500 chipsets which contained an errata (specificially errata > 53), which noted that these chipsets can't properly do interrupt remapping, > and > as a result the recommend that interrupt remapping be disabled in bios. While > many vendors have a bios update to do exactly that, not all do, and of course > not all users update their bios to a level that corrects the problem. As a > result, occasionally interrupts can arrive at a cpu even after affinity for > that > interrupt has be moved, leading to lost or spurrious interrupts (usually > characterized by the message: > kernel: do_IRQ: 7.71 No irq handler for vector (irq -1) > > There have been several incidents recently of people seeing this error, and > investigation has shown that they have system for which their BIOS level is > such > that this feature was not properly turned off. As such, it would be good to > give them a reminder that their systems are vulnurable to this problem. > > Signed-off-by: Neil Horman <nhor...@tuxdriver.com> > CC: Prarit Bhargava <pra...@redhat.com> > CC: Don Zickus <dzic...@redhat.com> > CC: Don Dutile <ddut...@redhat.com> > CC: Bjorn Helgaas <bhelg...@google.com> > CC: Asit Mallick <asit.k.mall...@intel.com> > CC: linux-...@vger.kernel.org > Ping, anyone want to Ack/Nack this? Neil
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