linux-kernel - Re: [PATCH] rcu: Eliminate softirq processing from rcutree

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Date:	Sat, 25 Jan 2014 06:20:26 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-rt-users@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] rcu: Eliminate softirq processing from rcutree

On Fri, 2014-01-24 at 20:46 +0100, Sebastian Andrzej Siewior wrote: 
> * Mike Galbraith | 2013-12-23 06:12:39 [+0100]:
> 
> >P.S.
> >
> >virgin -rt7 doing tbench 64 + make -j64
> >
> >[   97.907960] perf samples too long (3138 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
> >[  103.047921] perf samples too long (5544 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
> >[  181.561271] perf samples too long (10318 > 10000), lowering kernel.perf_event_max_sample_rate to 13000
> >[  184.243750] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 1.084 msecs
> >[  248.914422] perf samples too long (19719 > 19230), lowering kernel.perf_event_max_sample_rate to 7000
> >[  382.116674] NOHZ: local_softirq_pending 10
> This is block
> 
> >[  405.201593] perf samples too long (36824 > 35714), lowering kernel.perf_event_max_sample_rate to 4000
> >[  444.704185] NOHZ: local_softirq_pending 08
> >[  444.704208] NOHZ: local_softirq_pending 08
> >[  444.704579] NOHZ: local_softirq_pending 08
> >[  444.704678] NOHZ: local_softirq_pending 08
> >[  444.705100] NOHZ: local_softirq_pending 08
> >[  444.705980] NOHZ: local_softirq_pending 08
> >[  444.705994] NOHZ: local_softirq_pending 08
> >[  444.708315] NOHZ: local_softirq_pending 08
> >[  444.710348] NOHZ: local_softirq_pending 08
> 
> and this is RX. Is your testcase heavy disk-io or heavy disk-io +
> network?

Yeah.

-Mike

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