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Re: Summary of the Arm ports BoF at DC17




On Fri, Sep 15, 2017 at 07:11:38PM +0100, Ben Hutchings wrote:
>On Thu, 2017-09-14 at 03:40 +0100, Steve McIntyre wrote:
>[...]
>> There is optional kernel support to trap the exceptions here
>> and emulate the instructions, but it's really not recommended for
>> serious use (e.g. on a build machine!).
>[...]
>
>Why is it not recommended?  Terrible performance, or known bugs?

I've heard estimates for performance slowdown of a factor of 20 or
more, maybe worse. It's very dependent on the hardware and the code in
question obviously. Sorry, I don't have any references, I'm
afraid. :-/ Of course, the massive log overheard that Vagrant reports
won't help much either!

I'm not aware of any bugs OTTOMH.

-- 
Steve McIntyre, Cambridge, UK.                                steve@xxxxxxxxxx
There's no sensation to compare with this
Suspended animation, A state of bliss