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From: Marin Mitov <mitov@issp.bas.bg>
Organization: Institute of Solid State Physics
To: linux-kernel@vger.kernel.org
Subject: [BUG] CONFIG_IRQBALANCE=y broken?
Date: Mon, 7 Apr 2008 20:17:59 +0300
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Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       Stephen Hemminger <shemminger@linux-foundation.org>
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Hi Ingo, Thomas,

When kernel-2.6.24.x is compiled with 

CONFIG_IRQBALANCE=y, 

and heavy LAN (outbound) traffic, I experience LAN dying due to
IRQ# masked at the IO_APIC (bit 16 is 1, for the corresponding irq
vector) (SMP x86_32,  AMD X2), as described in my previous post:

http://lkml.org/lkml/2008/3/25/165

and links to previous posts there in. When

CONFIG_IRQBALANCE is not set

I am not able to reproduce the problem. That makes me think that 
there is a race/bug somewhere in the irq balancing code that 
leaves (rarely) the corresponding IRQ# masked at the IO-APIC.

Any comments, suggestions, patches?

Additional info?

Thank you in advance for your answer.

Regards

Marin Mitov