aboutsummaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorMichael Buesch <mb@bu3sch.de>2008-03-29 21:01:16 +0100
committerJohn W. Linville <linville@tuxdriver.com>2008-04-08 15:05:56 -0400
commit5100d5ac81b9330dc57e35adbe50923ba6107b8f (patch)
tree48224236b50703606c97c05ec077fde4880fc3b9 /include
parent3109ece1114293b8201d9c140d02d7ce9a9fa387 (diff)
b43: Add PIO support for PCMCIA devices
This adds PIO support back (D'oh!) for PCMCIA devices. This is a complete rewrite of the old PIO code. It does actually work and we get reasonable performance out of it on a modern machine. On a PowerBook G4 I get a few MBit for TX and a few more for RX. So it doesn't work as well as DMA (of course), but it's a _lot_ faster than the old PIO code (only got a few kBit with that). The limiting factor is the host CPU speed. So it will generate 100% CPU usage when the network interface is heavily loaded. A voluntary preemption point in the RX path makes sure Desktop Latency isn't hurt. PIO is needed for 16bit PCMCIA devices, as we really don't want to poke with the braindead DMA mechanisms on PCMCIA sockets. Additionally, not all PCMCIA sockets do actually support DMA in 16bit mode (mine doesn't). Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions