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Date: Fri, 21 Jan 2011 07:40:42 -0800
From: Matthew Jacob <mj@feral.com>
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To: Bruce Evans <brde@optusnet.com.au>
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Cc: freebsd-arch@freebsd.org
Subject: Re: removing -frename-registers from sys/conf.mk
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On 1/20/2011 10:15 PM, Bruce Evans wrote:
> On Thu, 20 Jan 2011, Matthew Jacob wrote:
>
>> Never mind this ill thought out request.
>>
>> On 1/20/2011 3:53 PM, Matthew Jacob wrote:
>>> It helps substantially in trying to debug amd64 kernels to remove 
>>> this flag.
>>>
>>> Has anyone heard of a good reason we need to keep this? Whom else 
>>> should I ask?
>
> What's ill-thought out about it?

What was ill thought out about it was that somebody at Panasas had 
reported that removing just this option made kernel crash dumps way 
easier to follow. But it turns out that they had also removed all 
optimizations as well (and hadn't told me). That made this a non-starter.