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

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Message-ID: <20140124194642.GA29981@linutronix.de>
Date:	Fri, 24 Jan 2014 20:46:42 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mike Galbraith <bitbucket@...ine.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

* 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?

Sebastian
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