On Monday 28 May 2007, Michael Buesch wrote: > Can you also test the following patch? > I think there's a bug in b44 that is doesn't properly discard > shared IRQs, so it might possibly generate a NAPI storm, dunno. > Worth a try. > > Index: linux-2.6.22-rc3/drivers/net/b44.c > =================================================================== > --- linux-2.6.22-rc3.orig/drivers/net/b44.c 2007-05-27 23:01:44.000000000 > +0200 +++ linux-2.6.22-rc3/drivers/net/b44.c 2007-05-28 12:48:27.000000000 > +0200 @@ -911,6 +911,8 @@ static irqreturn_t b44_interrupt(int irq > spin_lock(&bp->lock); > > istat = br32(bp, B44_ISTAT); > + if (istat == 0xFFFFFFFF) > + goto out; /* Shared IRQ not for us */ > imask = br32(bp, B44_IMASK); > > /* The interrupt mask register controls which interrupt bits > @@ -942,6 +944,7 @@ irq_ack: > bw32(bp, B44_ISTAT, istat); > br32(bp, B44_ISTAT); > } > +out: > spin_unlock(&bp->lock); > return IRQ_RETVAL(handled); > }
I did try this patch on a affected kernel, but I didn't notice any big difference. Perhaps the kernel is a bit less slow during the test, but It's hard to tell. Maxi
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