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Re: [Qemu-ppc] [Qemu-devel] [PATCH 28/32] ppc: Avoid double translation
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From: |
David Gibson |
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Subject: |
Re: [Qemu-ppc] [Qemu-devel] [PATCH 28/32] ppc: Avoid double translation for lvx/lvxl/stvx/stvxl |
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Date: |
Fri, 29 Jul 2016 15:42:22 +1000 |
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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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[Qemu-ppc] [PATCH 29/32] ppc: Don't set access_type on all load/stores on hash64, Benjamin Herrenschmidt, 2016/07/26
[Qemu-ppc] [PATCH 30/32] ppc: Use a helper to generate "LE unsupported" alignment interrupts, Benjamin Herrenschmidt, 2016/07/26
[Qemu-ppc] [PATCH 22/32] ppc: Don't update NIP if not taking alignment exceptions, Benjamin Herrenschmidt, 2016/07/26
[Qemu-ppc] [PATCH 26/32] ppc: Speed up dcbz, Benjamin Herrenschmidt, 2016/07/26
[Qemu-ppc] [PATCH 32/32] ppc: Speed up load/store multiple, Benjamin Herrenschmidt, 2016/07/26