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Olof Johansson 2889773131 [PATCH] powerpc: Lower threshold for DART enablement to 1GB

Turn on the DART already at 1GB. This is needed because of crippled
devices in some systems, i.e. Airport Extreme cards, only supporting
30-bit DMA addresses.

Otherwise, users with between 1 and 2GB of memory will need to manually
enable it with iommu=force, and that's no good.

Some simple performance tests show that there's a slight impact of
enabling DART, but it's in the 1-3% range (kernel build with disk I/O
as well as over NFS).

iommu=off can still be used for those who don't want to deal with the
overhead (and don't need it for any devices).

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2006-04-21 22:29:37 +10:00

dart_iommu.c

[PATCH] powerpc: Lower threshold for DART enablement to 1GB

2006-04-21 22:29:37 +10:00

dart.h

[PATCH] powerpc: Experimental support for new G5 Macs (#2 )

2006-01-09 15:03:17 +11:00

dcr.S

[PATCH] powerpc: trivial: modify comments to refer to new location of files

2006-02-10 16:53:51 +11:00

fsl_soc.c

[PATCH] powerpc: Add platform support for MPC834x USB controllers