Venti dumps were taking forever, so we investigated... turns out
DMA was turned off. I know I said "use DMA" when I installed, and
plan9.ini contains dmamode=ask, but DMA is not enabled at boot
and I am not asked if I want to use DMA. Additionally, the dmamode=
option is not documented in plan9.ini(8); I'm looking at the source right
now but so far I've been unable to find where the value is read.
I thought options given at installation were used in the system after
installing? I know that's the case for mouseport and vgasize, but not
for DMA? Why isn't dmamode= documented in plan9.ini(8)? Do you
turn on DMA in plan9.ini or by just putting an echo command in
cpurc?

John