Messages in this thread | | | Date | Tue, 5 Jun 2012 21:46:56 -0400 | From | Dave Jones <> | Subject | Re: NOHZ: local_softirq_pending 08 |
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On Wed, Jun 06, 2012 at 01:15:50AM +0200, Francois Romieu wrote: > Marc Dionne <marc.c.dionne@gmail.com> : > > If it helps, I've been seeing the same thing here on a system with an > > r8169. The message appears consistently enough on network startup to > > be able to track it down to this specific commit: > > 98ddf986fca17840e46e070354b7e2cd2169da15: r8169: bh locking redux > > and task scheduling. > > > > The softirq pending messages always come right after "link down" > > messages for the interface.
for me, they're during boot when the nic comes up, and then very occasionally afterwards.
> Let's see the traces. > > I have added some code to trace the timing and values of the irq in > rtl8169_interrupt(). Patches against current git are attached.
with these patches applied, I get a lot of spew in dmesg like ..
[ 98.659314] r8169 0000:01:00.0: eth0: event ring full. [ 98.763513] r8169 0000:01:00.0: eth0: event ring full. [ 99.182103] r8169 0000:01:00.0: eth0: event ring full. [ 99.294426] r8169 0000:01:00.0: eth0: event ring full. [ 99.420255] r8169 0000:01:00.0: eth0: event ring full. [ 99.455811] r8169 0000:01:00.0: eth0: event ring full. [ 99.520541] r8169 0000:01:00.0: eth0: event ring full. [ 99.730789] r8169 0000:01:00.0: eth0: event ring full. [ 99.887643] r8169 0000:01:00.0: eth0: event ring full. [ 103.798861] net_ratelimit: 43 callbacks suppressed
over and over..
> 'ip link set dev 8168b-lom up' + 'cat /sys/kernel/debug/tracing/trace':
What tracer do I need to configure to get make this work ? irqsoff ?
finally, /sys/kernel/debug/r8169/ is empty.
Dave
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