linux-kernel - Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems

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Date:	Thu, 10 Apr 2014 16:18:30 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <williams@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems

On Wed, 2014-04-09 at 15:19 -0400, Steven Rostedt wrote:

> If you have any benchmark on large machines I would be very happy if
> you could test this patch against the unpatched version of -rt.

Too bad I don't have (and know how to use) specjbb.

I dug up old vmark, thinking I'd be able to get some halfway useful
relative numbers from it, but that was a waste of a day.  The thing
performs so badly on 40 core box that rt _beats_ nopreempt, and after 2
nodes, you're going backward.  40 Westmere EX cores does a whopping ~2.5
* dinky old Q6600 box throughput.

-Mike

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