linux-kernel - Re: [RT LATENCY] 249 microsecond latency caused by slub's unfreeze

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Message-ID: <1364234613.6345.184.camel@gandalf.local.home>
Date:	Mon, 25 Mar 2013 14:03:33 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <clark@...hat.com>
Subject: Re: [RT LATENCY] 249 microsecond latency caused by slub's
 unfreeze_partials() code.

On Mon, 2013-03-25 at 17:51 +0000, Christoph Lameter wrote:
> On Mon, 25 Mar 2013, Steven Rostedt wrote:
> 
> > BTW, what impact does setting all cpu_partial files to zero have on the
> > system?
> 
> Slight slowdown in kfree since the frees are less likely to be batched.

If this makes it more deterministic, and lower worse case latencies,
then it's definitely worth the price.

-- Steve


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