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

From: Darren Hart
Date: Thu Jun 14 2007 - 03:02:31 EST

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


Darren Hart
IBM Linux Technology Center
Realtime Linux Team
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