On Tue, 2008-07-08 at 14:06 -0700, Dan Mick wrote: > Sebastien Roy wrote: > > What should I make of the following messages generated on my Toshiba > > Portégé r500? > > > > Jul 8 13:46:50 seb unix: [ID 954099 kern.info] NOTICE: IRQ16 is being > > shared by drivers with different interrupt levels. > > Jul 8 13:46:50 seb This may result in reduced system performance. > > It might be worth looking for messages with 'pcplusmp' in them to see what > drivers are sharing that interrupt, but...there's generally not a lot you > can do about it these days; interrupt inputs are fixed, assigned by the > system manufacturer. So it's mostly a matter of interest, and checking to > make sure it's not, say, your 1394 controller you never use, and your IDE > controller, which is critical. (if so, you could, say, disable the 1394 > driver. Then again, it's pretty unlikely a system would be so stupidly > designed.)
Thanks for the tip. It turns out that I have more than one of these shared IRQ notices during boot: Jul 8 17:24:56 seb unix: [ID 954099 kern.info] NOTICE: IRQ19 is being shared by drivers with different interrupt levels. Jul 8 17:25:03 seb unix: [ID 954099 kern.info] NOTICE: IRQ21 is being shared by drivers with different interrupt levels. Jul 8 17:25:12 seb unix: [ID 954099 kern.info] NOTICE: IRQ18 is being shared by drivers with different interrupt levels. Jul 8 17:25:34 seb unix: [ID 954099 kern.info] NOTICE: IRQ16 is being shared by drivers with different interrupt levels. According to the pcplusmp output, these correspond to the following driver instances: IRQ19: ahci instance 0 IRQ21: pcic instance 0 IRQ18: uhci instance 2 IRQ16: uhci instance #3 (note the #3, that's not a typo, pcplusmp decided to put a # sign in front of one of the uhci instances and not the other) I don't see any duplicate uses of these interrupts as reported by pcplusmp though. Is there perhaps a bug in the reporting and that there's in fact no clash? -Seb
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