netdev - Re: 2.6.20->2.6.21 - networking dies after random time

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Message-ID: <20070807125518.GA4669@ff.dom.local>
Date:	Tue, 7 Aug 2007 14:55:18 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Marcin Ślusarz <marcin.slusarz@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	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

On Tue, Aug 07, 2007 at 02:13:39PM +0200, Jarek Poplawski wrote:
> On Tue, Aug 07, 2007 at 11:52:46AM +0200, Jarek Poplawski wrote:
> > On Tue, Aug 07, 2007 at 11:37:01AM +0200, Marcin Ślusarz wrote:
...
> > > No, i don't need a break. I'll have more time in next weeks.
> > 
> > Great! So, I'll try to send a patch with _SW_RESEND in a few hours,
> > if Ingo doesn't prepare something for you.
> 
> So, the let's try this idea yet: modified Ingo's "x86: activate
> HARDIRQS_SW_RESEND" patch.
> (Don't forget about make oldconfig before make.)
> For testing only.
> 
> Cheers,
> Jarek P.
> 
> PS: alas there was not even time for "compile checking"...

And here is one more patch to test the same idea (chip->retrigger()).
Let's try i386 way! (I hope I will not be arrested for this...)
(Should be tested without any previous patches.)

Jarek P.

PS: as above

---

diff -Nurp 2.6.22.1-/arch/x86_64/kernel/io_apic.c 2.6.22.1/arch/x86_64/kernel/io_apic.c
--- 2.6.22.1-/arch/x86_64/kernel/io_apic.c	2007-07-09 01:32:17.000000000 +0200
+++ 2.6.22.1/arch/x86_64/kernel/io_apic.c	2007-08-07 14:37:45.000000000 +0200
@@ -1311,15 +1311,8 @@ static unsigned int startup_ioapic_irq(u
 static int ioapic_retrigger_irq(unsigned int irq)
 {
 	struct irq_cfg *cfg = &irq_cfg[irq];
-	cpumask_t mask;
-	unsigned long flags;
-
-	spin_lock_irqsave(&vector_lock, flags);
-	cpus_clear(mask);
-	cpu_set(first_cpu(cfg->domain), mask);
 
-	send_IPI_mask(mask, cfg->vector);
-	spin_unlock_irqrestore(&vector_lock, flags);
+	send_IPI_self(cfg->vector);
 
 	return 1;
 }
-
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