linux-kernel - Re: [PATCH v2] sched/completion: convert completions to use simple wait queues

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Message-ID: <20160516163809.7bac1d54@redhat.com>
Date:	Mon, 16 May 2016 16:38:09 -0400
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Daniel Wagner <wagi@...om.org>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Daniel Wagner <daniel.wagner@...-carit.de>
Subject: Re: [PATCH v2] sched/completion: convert completions to use simple
 wait queues

On Thu, 12 May 2016 16:08:34 +0200
Daniel Wagner <wagi@...om.org> wrote:

> In short, I haven't figured out yet why the kernel builds get slightly slower. 

You're doing make -j 200, right? How many cores do you have? Couldn't it
be that you're saturating your CPUs?

You could try make -j<NR CPUs>, or some process creation benchmark. Although
I don't know what's the best way to measure this.