Re: Summary of the Arm ports BoF at DC17
- Date: Sun, 17 Sep 2017 22:50:24 +0100
- From: Steve McIntyre <steve@xxxxxxxxxx>
- Subject: 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