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Date: Fri, 02 Mar 2007 11:45:13 -0700
From: Scott Long <scottl@samsco.org>
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To: John Baldwin <jhb@FreeBSD.org>
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Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org,
	Kris Kennaway <kris@obsecurity.org>
Subject: Re: cvs commit: src/sys/kern kern_intr.c
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John Baldwin wrote:
> On Friday 02 March 2007 12:28, Kris Kennaway wrote:
>> On Fri, Mar 02, 2007 at 10:13:54AM -0700, Scott Long wrote:
>>> John Baldwin wrote:
>>>> jhb         2007-03-02 17:01:45 UTC
>>>>
>>>>  FreeBSD src repository
>>>>
>>>>  Modified files:
>>>>    sys/kern             kern_intr.c 
>>>>  Log:
>>>>  - Don't do the interrupt storm protection stuff for software interrupt
>>>>    handlers.
>>>>  - Use pause() when throtting during an interrupt storm.
>>>>  
>>>>  Reported by:    kris (1)
>>>>  
>>>>  Revision  Changes    Path
>>>>  1.142     +3 -2      src/sys/kern/kern_intr.c
>>> Actually, having this helped detect a problem with a CAM driver.
>>>
>>> Scott
>> I saw it under normal operation when doing a lot of loopback traffic
>> on an 8-core.
> 
> Also, if it ever kicked in for softclock, the system would deadlock.
> 

Can it be selectively enabled?

Scott