linux-kernel - Re: [tip:sched/urgent] sched: Fix cross-cpu clock sync on remote wakeups

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Message-ID: <1307098713.2353.3099.camel@twins>
Date:	Fri, 03 Jun 2011 12:58:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Milton Miller <miltonm@....com>
Cc:	Yong Zhang <yong.zhang0@...il.com>, Borislav Petkov <bp@...64.org>,
	Borislav Petkov <bp@...en8.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"markus@...ppelsdorf.de" <markus@...ppelsdorf.de>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:sched/urgent] sched: Fix cross-cpu clock sync on remote
 wakeups

On Fri, 2011-06-03 at 12:55 +0200, Peter Zijlstra wrote:
> On Fri, 2011-06-03 at 12:36 +0200, Peter Zijlstra wrote:
> > > Can we get some numbers for how often the two cases occur on some
> > > various workloads?
> > 
> > Sure, let me stick some counters in. 
> 
> Of 128765 IPIs, 17483 were with an empty list (boot + make -j64).
> 
> I didn't yet look at where those empty ones originated from.

After two more make clean; make -j64 cycles thats:

 250082:24793

So on this load its 10+:1.
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