From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
Roel Kluin <roel.kluin@gmail.com>,
"linuxppc-dev@ozlabs.org list" <linuxppc-dev@ozlabs.org>,
Richard Purdie <rpurdie@rpsys.net>,
Anton Blanchard <anton@samba.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH]: powerpc: Fix build breakage due to incorrect location of autoconf.h
Date: Thu, 14 Jan 2010 20:43:44 +1100 [thread overview]
Message-ID: <1263462224.724.356.camel@pasglop> (raw)
In-Reply-To: <OF7EAC50CA.1271BCB8-ONC12576AB.00321D31-C12576AB.00329588@transmode.se>
On Thu, 2010-01-14 at 10:12 +0100, Joakim Tjernlund wrote:
> > No, that was on purpose. If an arch doesn't have efficient unaligned
> > accesses, then they should not use the optimization since it will
> result
> > in a lot of unaligned accesses :-) In which case they are better off
> > falling back to the old byte-by-byte method.
>
> Not quite, it is only 1 of 4 accesses that uses unaligned and
> that accesses is only unaligned 50% in average, it might still
> be faster. We will never know now.
Why ? If you think it's a win, then it's easy to make a patch to turn
it to __KERNEL__ and ask some people from ARM and MIPS or even sparc
land for example to give it a spin. If it's indeed a win, then submit it
to Linus and/or Andrew and there's no reason for it not to go in.
I simply took a more conservative approach for post -rc4
Cheers,
Ben.
next prev parent reply other threads:[~2010-01-14 9:45 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-12 2:21 [PATCH]: powerpc: Fix build breakage due to incorrect location of autoconf.h Anton Blanchard
2010-01-12 3:01 ` Stephen Rothwell
2010-01-12 11:59 ` Joakim Tjernlund
2010-01-13 18:54 ` Kumar Gala
2010-01-13 20:02 ` Benjamin Herrenschmidt
2010-01-14 7:47 ` Joakim Tjernlund
2010-01-14 8:57 ` Benjamin Herrenschmidt
2010-01-14 9:12 ` Joakim Tjernlund
2010-01-14 9:43 ` Benjamin Herrenschmidt [this message]
2010-01-14 10:22 ` Joakim Tjernlund
2010-01-14 13:27 ` Joakim Tjernlund
2010-01-14 19:59 ` Benjamin Herrenschmidt
2010-01-25 8:19 ` Joakim Tjernlund
2010-01-27 12:16 ` Joakim Tjernlund
2010-01-28 1:05 ` Andrew Morton
2010-01-28 8:52 ` Joakim Tjernlund
2010-01-29 23:49 ` Andrew Morton
2010-01-30 10:47 ` Joakim Tjernlund
2010-01-12 7:11 ` Joakim Tjernlund
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