From: Sanjay Patel <sanjay3000@yahoo.com>
To: Arnd Bergmann <arnd@arndb.de>, Gunnar von Boehn <VONBOEHN@de.ibm.com>
Cc: Mark Nelson <markn@au1.ibm.com>,
linuxppc-dev@ozlabs.org, Michael Ellerman <ellerman@au1.ibm.com>,
cbe-oss-dev@ozlabs.org
Subject: Re: [RFC 1/3] powerpc: __copy_tofrom_user tweaked for Cell
Date: Thu, 19 Jun 2008 09:13:09 -0700 (PDT) [thread overview]
Message-ID: <973448.15152.qm@web33101.mail.mud.yahoo.com> (raw)
In-Reply-To: <OF3C6636F6.52E3D242-ONC125746D.005214B0-C125746D.0053FABE@de.ibm.com>
--- On Thu, 6/19/08, Gunnar von Boehn <VONBOEHN@de.ibm.com> wrote:
> You are right the main copy2user requires that the SRC is
> cacheable.
> IMHO because of the exception on load, the routine should
> fallback to the
> byte copy loop.
>
> Arnd, could you verify that it works on localstore?
Since the main loops use 'dcbz', the destination must also be cacheable. IIRC, if the destination is write-through or cache-inhibited, the 'dcbz' will cause an alignment exception. I suppose it would still function correctly via the handler, but horribly slowly.
--Sanjay
next prev parent reply other threads:[~2008-06-19 16:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-19 7:53 [RFC 1/3] powerpc: __copy_tofrom_user tweaked for Cell Mark Nelson
2008-06-19 14:43 ` Arnd Bergmann
2008-06-19 15:17 ` Gunnar von Boehn
2008-06-19 16:13 ` Sanjay Patel [this message]
2008-06-20 11:36 ` Gunnar von Boehn
2008-06-20 17:46 ` Sanjay Patel
2008-06-20 23:20 ` Benjamin Herrenschmidt
2008-06-20 23:44 ` Sanjay Patel
2008-06-23 8:30 ` Gunnar von Boehn
2008-06-23 12:07 ` Geert Uytterhoeven
2008-06-23 23:49 ` Paul Mackerras
2008-06-27 13:30 ` Gunnar von Boehn
2008-06-20 1:13 ` [Cbe-oss-dev] " Paul Mackerras
2008-06-20 16:47 ` Gunnar von Boehn
2008-06-21 2:00 ` Arnd Bergmann
2008-06-21 4:30 ` Paul Mackerras
2008-06-21 4:49 ` David Miller
2008-06-21 21:06 ` Arnd Bergmann
2008-06-20 1:55 ` Mark Nelson
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