On 01/25/2012 01:18 AM, Mike Galbraith wrote:
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.
Yes this experiment was when running with only one core.
-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
