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dahdi-linux/drivers/dahdi/oct612x/include
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Shaun Ruffell c9e258b9b0 wct4xxp: Reduce the memory footprint of the hardware echocanceler. 
This saves ~300K of kernel memory for each quad or dual span VPM.  Due
to the fact that this change disables caching of the NLP words (among
other things), the time to disable the echocans appears to have
increased by ~1ms.

Before this change:
=======================================================================
0) ! 356.498 us  |  vpm450m_setecmode(); <--- disable
0) ! 387.762 us  |  vpm450m_setecmode(); <--- enable
0) ! 429.839 us  |  vpm450m_setecmode(); <--- disable

]# echo 1 > /proc/sys/vm/drop_caches && free -k
total       used       free     shared    buffers     cached
Mem:       2005352     228368    1776984          0        132
5540
-/+ buffers/cache:     222696    1782656
Swap:       983036          0     983036

After this change:
=======================================================================
0) ! 1109.515 us |  vpm450m_setecmode(); <--- disable
0) ! 339.017 us  |  vpm450m_setecmode(); <--- enable
0) ! 1431.460 us |  vpm450m_setecmode(); <--- disable

]# echo 1 > /proc/sys/vm/drop_caches && free -k
total       used       free     shared    buffers     cached
Mem:       2005352     228080    1777272          0        112
5484
-/+ buffers/cache:     222484    1782868
Swap:       983036          0     983036

Signed-off-by: Shaun Ruffell <sruffell@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9750 a0bf4364-ded3-4de4-8d8a-66a801d63aff
2011-02-10 16:22:49 +00:00
..
apilib wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
oct6100api wct4xxp: Reduce the memory footprint of the hardware echocanceler. 2011-02-10 16:22:49 +00:00
octrpc wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
digium_unused.h wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
octdef.h wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
octmac.h wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
octosdependant.h wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
octtype.h wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
octtypevx.h wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00
octtypewin.h wct4xxp: Moving the transmit short detection behind debug module param. 2010-08-27 21:59:27 +00:00