linux-kernel - [BUG] CONFIG_IRQBALANCE=y broken?

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Message-Id: <200804072017.59428.mitov@issp.bas.bg>
Date:	Mon, 7 Apr 2008 20:17:59 +0300
From:	Marin Mitov <mitov@...p.bas.bg>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: [BUG] CONFIG_IRQBALANCE=y broken?

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

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