Shawn On Tue, Apr 11, 2017 at 5:54 PM, Shawn Lin <shawn.lin at rock-chips.com> wrote: >> This doesn't surprise me at all. What surprises me, though, is that >> nobody else seems to be able to reproduce this. >> >> On veyron, WiFi is connected via SDIO. For good speed, it uses SDIO >> Interrupts. See this bit in the device tree: >> >> cap-sdio-irq; >> > > all of *my* boards are using side-band interrupt, so there are no > "cap-sdio-irq". They are all using side-band interrupt? What WiFi device do you have connected? If you're truly using a side-band interrupt using the dedicated SDIO interrupt pin on your SoC, I'm pretty sure you still need to define cap-sdio-irq in order for things to work properly. If you don't do that, you'll get "polling mode" for SDIO Interrupts. See sdio_irq_thread() where you can see that the kernel will poll your device every 10 ms if MMC_CAP_SDIO_IRQ isn't set. Maybe you should try defining cap-sdio-irq and see if you get a big performance boost?
