From: Paul Mackerras <paulus@samba.org>
To: Kallol Biswas <Kallol_Biswas@pmc-sierra.com>
Cc: linuxppc-dev@ozlabs.org
Subject: RE: memory with __get_free_pages and disabling caching
Date: Sat, 25 Mar 2006 09:17:23 +1100 [thread overview]
Message-ID: <17444.28659.604385.647249@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <478F19F21671F04298A2116393EEC3D50A9C21@sjc1exm08.pmc_nt.nt.pmc-sierra.bc.ca>
Kallol Biswas writes:
> We have a little endian device on a PPC 440GX based system.
> The descriptors need to be swapped. With E bit turned on we can save
> swapping time.
Writing the descriptors with stwbrx should be just as fast as using
stw, and eliminates the need for a special mapping.
If you need it to be cache-inhibited, you should be using
dma_alloc_coherent() or pci_alloc_consistent().
Paul.
next prev parent reply other threads:[~2006-03-24 22:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-24 19:13 memory with __get_free_pages and disabling caching Kallol Biswas
2006-03-24 19:29 ` Kumar Gala
2006-03-24 22:17 ` Paul Mackerras [this message]
2006-03-24 22:30 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2006-03-24 23:44 Kallol Biswas
2006-03-25 0:20 ` Benjamin Herrenschmidt
2006-03-25 0:29 ` Matt Porter
2006-03-25 0:27 ` Matt Porter
2006-03-25 1:02 ` Benjamin Herrenschmidt
2006-03-25 1:25 ` Matt Porter
2006-03-24 2:15 Kallol Biswas
2006-03-24 3:05 ` Benjamin Herrenschmidt
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