On Mon, Feb 24, 2014 at 04:38:48PM -0600, Joel Fernandes wrote: > Actually I did do some tracing earlier before I posted this thread- and > notice there was excessive traces of locking/unlocking. It is very light > though as you pointed and lighter without debug options. The only other > notable difference is the fact that we are now going through the dmaengine > framework in the newer kernel vs the faster one. Okay, for OMAP, there's additional latency caused by the tasklet which starts a transaction when there's no previous transaction running - that will be your biggest problem. I do want to move omap-dma away from having a fixed binding between claimed channels and the logical channels since that's too wasteful, and that's what the tasklet will eventually be doing - but with omap-dma being divorsed from the old code, this tasklet may not be necessary anymore (since we no longer have to operate in process context for that bit.) There's a huge pile of patches I have queued up for the next merge window in linux-next - I'd rather get these into mainline before trying to do any restructuring, otherwise we're going to get into a hell of a problem with merge conflicts. -- FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly improving, and getting towards what was expected from it. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
