Andre Schwarz wrote:
Grant,
I know I'm not Grant, but..
do you know if someone's working on a more generic DMA solution using BestComm engine on 5200B ? Maybe somthing that accepts a sg-list with callback ops or completion ?
It was suggested once or twice, not least by me.
Is it possible right now to accelerate simple memcpy ops ?
From my discussions on the subject with Sylvain, it's possible, you just need to use the GenBD and initiate it manually, however it's probably more overhead than work if the data size is small, and BestComm would do better to copy full 32-bit words at a time, and stay aligned, if you have an odd-sized transfer from a non-32-bit aligned address, then you may have to do some incredible amount of work which makes the actual transfer not worth doing (by the time you set it up, the CPU could have copied it on it's own already, I guess what you DO gain is a kernel preemption point.. the CPU can do other things that are important) I for one, though, whether it speeds stuff up or not, love to see this in action and am very willing to test and benchmark it. I would love to see more users, too, as the network stack is not the only system that can benefit.. On a related note does anyone know of the status or what is going on with Clifford Wolf's dmatransfer API? -- Matt Sealey <[EMAIL PROTECTED]> Genesi, Manager, Developer Relations _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
