Subject: bus_dmamap_ limitation
To: None <tech-kern@netbsd.org>
From: mike varga <mike.varga@cavium.com>
List: tech-kern
Date: 04/02/2002 10:59:40
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I have been using the combination
of=20
bus_dmamem_alloc()
bus_dmamem_map()
bus_dmamap_create()
bus_dmamap_load()
repeatedly to allocate dma buffers.
I found that when I allocate
more than 1000, other drivers
will not attach successfully.
Is there a "#defined" limit?
Can I modify it? Or is there another
way to increase this limit? I have
already removed all unnecessary=20
drivers from my config file.
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<DIV><FONT face=3DArial size=3D2>I have been using the =
combination</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>of </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>bus_dmamem_alloc()</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>bus_dmamem_map()</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>bus_dmamap_create()</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>bus_dmamap_load()</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>repeatedly to allocate dma =
buffers.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I found that when I =
allocate</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>more than 1000, other =
drivers</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>will not attach =
successfully.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Is there a </FONT><FONT face=3DArial=20
size=3D2>"#defined" limit?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Can I modify it? Or is there =
another</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>way to increase this limit? I =
have</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>already removed all unnecessary =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>drivers </FONT><FONT face=3DArial =
size=3D2>from my=20
config file.</FONT></DIV></BODY></HTML>
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