On Thu, Apr 18, 2013 at 05:02:39PM +0200, Joerg Roedel wrote: > On Tue, Apr 16, 2013 at 04:38:32PM -0400, 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. For > > details of those that reported the problem, please see: > > https://bugzilla.redhat.com/show_bug.cgi?id=887006 > > > > 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: David Woodhouse <dw...@infradead.org> > > CC: linux-...@vger.kernel.org > > CC: Joerg Roedel <j...@8bytes.org> > > CC: Konrad Rzeszutek Wilk <konrad.w...@oracle.com> > > CC: Arkadiusz Miśkiewicz <ar...@maven.pl> > > Applied with some small changes to my x86/vt-d branch, thanks Neil. > > > Thanks! Neil
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