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Re: [Qemu-devel] [PATCH 28/32] ppc: Avoid double translation for lvx/lvx


From: David Gibson
Subject: Re: [Qemu-devel] [PATCH 28/32] ppc: Avoid double translation for lvx/lvxl/stvx/stvxl
Date: Fri, 29 Jul 2016 15:42:22 +1000
User-agent: Mutt/1.6.2 (2016-07-01)

On Fri, Jul 29, 2016 at 02:58:07PM +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2016-07-29 at 14:40 +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2016-07-29 at 13:34 +1000, David Gibson wrote:
> > > 
> > >  
> > > What should I do with this in the short term?  Leave it in
> > > ppc-for-2.8, or remove it for now pending possible changes?
> > 
> > I think I'm still measuring a performance improvement with this, I'll
> > test a bit more and will get back to you.
> > 
> > It will definitely better to do it without a helper once Richard's 128-
> > bit stuff is in.
> 
> Ok, after I nice'd myself on top of all the gcc's on that test machine
> I confirm that this patch is a loss on qemu-user. It might still be a
> win for qemu-system-ppc64 due to the translation but probably not
> worth bothering.
> 
> So drop this one. I'll use the 128-bit support when it becomes
> available.

Done.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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