A little utility to optimize performance on your Sam440ep
board (mini-itx and flex versions)
* on some Sam440ep boards, the MMUCR register is not set correctly
This leads to poor write L1 cache performances.
The utility check the register, and if needed, modify it.
* on all Sam440ep boards with a Radeon card enables read prefetching
for graphic ram.
If a Radeon card is detected, the utility will modify the
POM2 PCI registers to enable read prefetching.
This speed up reads for the gfx card from 15 MB/s to 30 MB/s
on a M9 card.
* set the Latency Timer on the 440ep PCI Bridge,
With this new setting read speed increase around 50% on Radeon
PCI cards (up to 42 MB/s on a M9 card) and around 200% on
RadeonHD PCI cards
* use a more aggressive instruction cache speculative prefetching
This allows a faster execution for some software, for example
Blender speed test increased performance by 10%-20%:
bldyn -b projects/bricks_and_water_plugin.blend -o ram:pool
-F JPEG -f 0
As a sidenote some values returned by Ragemem are incorrect
(MIPS) or lower
(L2 cache read64/write64) when this setting is enabled.
To disable this setting, add NOCCR argument to the command
* add the utility to WBStartup with Prefs/WBStartup, or put
it in S:user-startup if you need to specify arguments
* if run from the shell, it accept the following arguments:
VERBOSE to show some informations
SNDGFX to enable prefetching on the secondary gfx card (in
case there is one)
FORCEPOM to modify POM2 registers even if they are already
set (for example to switch prefetching from the primary to
the secondary gfx card)
* This utility may be obsolete with a future AOS4.1 update
- Version 1.3
now use a more aggressive instruction cache speculative prefetching
added NOCCR argument.
11-Feb-2011 - Version 1.2
added SNDGFX and FORCEPOM arguments.
now set the Latency Timer on the 440ep PCI Bridge.
01-Dec-2010 - Version 1.1
there was a bug in the detection of the MMUCR setup, fixed.
more information displayed in VERBOSE mode.
- Version 1.0
Requires: AmigaOS4.1 and Sam440ep (mini-itx or flex-atx)
For further information, please contact us: firstname.lastname@example.org