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Re: [Qemu-ppc] [Qemu-devel] [PATCH 28/32] ppc: Avoid double translation
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From: |
Benjamin Herrenschmidt |
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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 14:58:07 +1000 |
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.
Cheers,
Ben.
[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