linux-kernel - Re: 2.6.20->2.6.21 - networking dies after random time

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Message-ID: <20070726091254.GA8063@elte.hu>
Date:	Thu, 26 Jul 2007 11:12:54 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jarek Poplawski <jarkao2@...pl>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Marcin ??lusarz <marcin.slusarz@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jean-Baptiste Vignaud <vignaud@...dmail.fr>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	shemminger <shemminger@...ux-foundation.org>,
	linux-net <linux-net@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: 2.6.20->2.6.21 - networking dies after random time


* Jarek Poplawski <jarkao2@...pl> wrote:

> On Thu, Jul 26, 2007 at 10:31:20AM +0200, Ingo Molnar wrote:
> ...
> > yeah. The patch below enables sw-resend on x86, to test the theory 
> > whether the APIC-driven hardware-vector-resend code has some problem.
> 
> I think Marcin is using x86_64 (Athlon 64) yet.

yeah - i meant to cover both arches but forgot about x86_64 - updated 
patch attached below.

	Ingo

----------------->
Subject: x86: activate HARDIRQS_SW_RESEND
From: Ingo Molnar <mingo@...e.hu>

activate the software-triggered IRQ-resend logic.

it appears some chipsets/cpus do not handle local-APIC driven IRQ
resends all that well, so always use the soft mechanism to trigger
the execution of pending interrupts.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/i386/Kconfig   |    4 ++++
 arch/x86_64/Kconfig |    4 ++++
 kernel/irq/manage.c |    8 ++++++++
 3 files changed, 16 insertions(+)

Index: linux-rt-rebase.q/arch/i386/Kconfig
===================================================================
--- linux-rt-rebase.q.orig/arch/i386/Kconfig
+++ linux-rt-rebase.q/arch/i386/Kconfig
@@ -1284,6 +1284,10 @@ config GENERIC_PENDING_IRQ
 	depends on GENERIC_HARDIRQS && SMP
 	default y
 
+config HARDIRQS_SW_RESEND
+	bool
+	default y
+
 config X86_SMP
 	bool
 	depends on SMP && !X86_VOYAGER
Index: linux-rt-rebase.q/arch/x86_64/Kconfig
===================================================================
--- linux-rt-rebase.q.orig/arch/x86_64/Kconfig
+++ linux-rt-rebase.q/arch/x86_64/Kconfig
@@ -721,6 +721,10 @@ config GENERIC_PENDING_IRQ
 	depends on GENERIC_HARDIRQS && SMP
 	default y
 
+config HARDIRQS_SW_RESEND
+	bool
+	default y
+
 menu "Power management options"
 
 source kernel/power/Kconfig
Index: linux-rt-rebase.q/kernel/irq/manage.c
===================================================================
--- linux-rt-rebase.q.orig/kernel/irq/manage.c
+++ linux-rt-rebase.q/kernel/irq/manage.c
@@ -175,6 +175,14 @@ void enable_irq(unsigned int irq)
 		desc->depth--;
 	}
 	spin_unlock_irqrestore(&desc->lock, flags);
+#ifdef CONFIG_HARDIRQS_SW_RESEND
+	/*
+	 * Do a bh disable/enable pair to trigger any pending
+	 * irq resend logic:
+	 */
+	local_bh_disable();
+	local_bh_enable();
+#endif
 }
 EXPORT_SYMBOL(enable_irq);
 
-
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