linux-kernel - Re: [SMP BUG] [clockevents: i386 drivers patch] introduces irqbalance-does-not-work-properly problem

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Date:	Sun, 20 May 2007 19:48:01 +0900
From:	Komuro <komurojun-mbn@...ty.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: [SMP BUG]  [clockevents: i386 drivers patch]  introduces 
 irqbalance-does-not-work-properly problem

On Sun, 20 May 2007 09:09:16 +0200
Thomas Gleixner <tglx@...utronix.de> wrote:


> > Mr. Thomas Gleixner,
> >  any idea to fix this problem?
> 
> Which problem ?

The problem is CPU1 receives 38239 interrupt-16
but CPU0 receives only 15 interrupt-16
CPU0 should receive more interrupts.

           CPU0       CPU1       
  0:         85          0   IO-APIC-edge      timer
  1:          0        698   IO-APIC-edge      i8042
  6:          0          5   IO-APIC-edge      floppy
  8:          0          1   IO-APIC-edge      rtc
  9:          0          0   IO-APIC-fasteoi   acpi
 12:          0        114   IO-APIC-edge      i8042
 14:        369       2281   IO-APIC-edge      ide0
 15:          0         24   IO-APIC-edge      ide1
 16:         15      38239   IO-APIC-fasteoi   yenta, pcnet_cs   <<< problem
 17:          0          0   IO-APIC-fasteoi   yenta
NMI:          0          0 
LOC:      50548      50547 
ERR:          0
MIS:      15503


Best Regards
Komuro

> On Sun, 2007-05-20 at 11:14 +0900, Komuro wrote:
> > Hi,
> > 
> > 
> > [clockevents: i386 drivers patch] introduces
> >   irqbalance-does-not-work-properly problem.
> 
> it disables irq balancing for IRQ0, but this does not affect any other
> interrupts. It is almost irrelevant as the PIT/HPET timer interrupt
> (irq0) is disabled anyway and the local apic timer is used.
> 
> > >            CPU0       CPU1       
> > >   0:         85          0   IO-APIC-edge      timer
> 
> There is no interrupt happening after bootup, so balancing is not a
> problem here.
> 
> > Mr. Thomas Gleixner,
> >  any idea to fix this problem?
> 
> Which problem ?
> 
> 	tglx
> 
> 
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