On Thu, Nov 23, 2017 at 11:26:04AM +0100, Ladislav Michl wrote: > On Thu, Nov 23, 2017 at 10:35:42AM +0100, Ladislav Michl wrote: > > On Thu, Nov 16, 2017 at 03:04:48PM -0600, Grygorii Strashko wrote: > > [snip] > > > I recommend to disable CPU idle completely in config and re-check test, > > > before continue with other things. > > > > Strangely enough latency is much worse with CONFIG_CPU_IDLE disabled. > > While it is better with: > CONFIG_HZ_PERIODIC=y > CONFIG_CPU_FREQ=n > CONFIG_PM=n > > But both ehci and musb does not see any device connected and: [snip] The culprit here is CONFIG_PM. With CONFIG_PM disabled latency jitter is about 30us, which is pretty good for general purpose OS. But some drivers do not work without CONFIG_PM. Suggestions? Thank you, ladis -- 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
