On 11/12/2015 07:54 AM, Ran Shalit wrote: > Hello, > > I hope you can assist me on the following debate. > > I need to develop a driver/application which capture and output video > frames from PCIe device , and is using Intel cpu (i7), and Intel's > media sdk server framework for the video compression. > > I am not sure what will be a better choice between the following 2 options: > 1. application which use dpdk for capture and output to the PCIe device > 2. v4l driver for the PCIe device > > Intel advocate the usage of dpdk (framework for packet processing). > dpdk is supposed to be able to read/write from PCIe device too. > I tried to see the prons/cons of dpdk compared to v4l. Of course they advocate it: it will lock you in to their CPU and their SDK. V4L2 is platform independent: your PCIe device will work just as well on other platforms and with any v4l2-aware application. > > prons of dpdk, as I understand them: > 1. userspace application (easier debugging compared to kernel > debugging of v4l device driver) But you probably have to do all the work and you can't use any of the frameworks v4l2 gives you to simplify driver development. > 2. supposed better performance 2 is nonsense. Video capture/output is just a matter of setting up the DMA and feeding it buffers. The CPU is barely involved. > > cons of dpdk compared to v4l: > 1. I could not find examples for PCIe device usage , or samples for > showing how application (such as media sdk) use dpdk video frames. That might be a hint that it is perhaps not the best choice. On the other hand, asking this on the linux-media mailinglist will give you a biased answer :-) Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
