On Wed, 2012-01-25 at 09:55 +0100, Uwe Kleine-König wrote: > 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 Hm, makes sense if this is a UP box. SMP would just go borrow a cup of runtime from a neighbor. -Mike -- 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
