From: Michael Ellerman <patch-notifications@ellerman•id.au>
To: Anton Blanchard <anton@ozlabs•org>,
benh@kernel•crashing.org, paulus@samba•org, npiggin@gmail•com
Cc: linuxppc-dev@lists•ozlabs.org
Subject: Re: [1/2] powerpc: Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little endian
Date: Wed, 5 Oct 2016 13:36:24 +1100 (AEDT) [thread overview]
Message-ID: <3spfzr1tf0z9s5g@ozlabs.org> (raw)
In-Reply-To: <1474806941-5006-1-git-send-email-anton@ozlabs.org>
On Sun, 2016-25-09 at 12:35:40 UTC, Anton Blanchard wrote:
> From: Anton Blanchard <anton@samba•org>
>
> POWER8 handles unaligned accesses in little endian mode, but commit
> 0b5e6661ac69 ("powerpc: Don't set HAVE_EFFICIENT_UNALIGNED_ACCESS on
> little endian builds") disabled it for all.
>
> The issue with unaligned little endian accesses is specific to POWER7,
> so update the Kconfig check to match. Using the stat() testcase from
> commit a75c380c7129 ("powerpc: Enable DCACHE_WORD_ACCESS on ppc64le"),
> performance improves 15% on POWER8.
>
> Signed-off-by: Anton Blanchard <anton@samba•org>
Series applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/8a18cc0c2c36ee49d70a620ac0190d
cheers
prev parent reply other threads:[~2016-10-05 2:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-25 12:35 [PATCH 1/2] powerpc: Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little endian Anton Blanchard
2016-09-25 12:35 ` [PATCH 2/2] powerpc: Set default CPU type to POWER8 for little endian builds Anton Blanchard
2016-09-25 22:45 ` [PATCH 1/2] powerpc: Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little endian Benjamin Herrenschmidt
2016-09-25 23:07 ` Anton Blanchard
2016-10-05 2:36 ` Michael Ellerman [this message]
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