linux-kernel - Re: [PATCH RT] fix migrating softirq [cause of network hang]

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Message-Id: <200706140002.17411.dvhltc@us.ibm.com>
Date:	Thu, 14 Jun 2007 00:02:17 -0700
From:	Darren Hart <dvhltc@...ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>
Subject: Re: [PATCH RT] fix migrating softirq [cause of network hang]

On Wednesday 13 June 2007 05:47:16 Steven Rostedt wrote:

> This patch temporarily binds the hardirq thread on the CPU that it runs
> the softirqs on.  With this patch I have not seen my network hang. I ran
> it over night, doing compiles and such, and it seems fine. I would be
> able to cause the hang with various loads within a minute, now I can't
> cause it after several minutes.
>
> I'm assuming that this fix may fix other bugs too.
>

I ran 2.6.21-rt10 + this patch with kernbench and then loops building a kernel 
(which would previously rapidly exhaust memory).  It successfully built 400 
kernels with "make -j 32" on an 8 opteron machine with 8 GB of RAM and has so 
far completed 25 "make -j" on the same system.  Looks like a winner to me so 
far.

Thanks,

-- 
Darren Hart
IBM Linux Technology Center
Realtime Linux Team
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