Hello, On Tue, Jan 24, 2012 at 06:39:34PM -0800, Venkat Subbiah wrote: > In the process of debugging a napi ethernet driver performance > issue, what I am noticing is > > 1. While the driver is in the middle of a napi packet processing > loop, there is a task switch from > sirq-net-rx to idle even though there is pending napi processing to be done. I didn't check your logs below, but maybe this is related to the default settings in /proc/sys/kernel/sched_rt_period_us and /proc/sys/kernel/sched_rt_runtime_us? That is 0.05s per second is reserved for non-RT tasks tasks such that a run-away realtime process will not lock up the machine. To verify that, try echo -1 > /proc/sys/kernel/sched_rt_runtime_us . Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
