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From: Karim Yaghmour <karim@opersys.com>
To: "Bill Huey (hui)" <bhuey@lnxw.com>
Cc: Kristian Benoit <kbenoit@opersys.com>,
	linux-kernel@vger.kernel.org, paulmck@us.ibm.com, andrea@suse.de,
	tglx@linutronix.de, mingo@elte.hu, pmarques@grupopie.com,
	bruce@andrew.cmu.edu, nickpiggin@yahoo.com.au, ak@muc.de,
	sdietrich@mvista.com, dwalker@mvista.com, hch@infradead.org,
	akpm@osdl.org, rpm@xenomai.org
Subject: Re: PREEMPT_RT vs I-PIPE: the numbers, part 2
Date: Wed, 22 Jun 2005 16:10:57 -0400	[thread overview]
Message-ID: <42B9C5D1.3020403@opersys.com> (raw)
In-Reply-To: <20050622192927.GA13817@nietzsche.lynx.com>


Bill Huey (hui) wrote:
> FreeBSD went through some slow down when they moved to SMPng, but not
> the kind of numbers you show for things surrounding the network stack.
> Something clearly bad happened.

Note that the numbers are not freak accidents, they are consistent
accross the various setups. So in total, that's 15 LMbench runs,
all showing consistent _severe_ cost for preempt_rt. And this despite
the fact that it comes down neck-to-neck with the ipipe on
interrupt response time in those same tests. I would highly suggest
setting up an automated benchmark for automatically running LMbench
on every preempt_rt release and compare that to the vanilla kernel.

Karim
-- 
Author, Speaker, Developer, Consultant
Pushing Embedded and Real-Time Linux Systems Beyond the Limits
http://www.opersys.com || karim@opersys.com || 1-866-677-4546

  parent reply	other threads:[~2005-06-22 20:00 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-20 17:13 PREEMPT_RT vs I-PIPE: the numbers, part 2 Kristian Benoit
2005-06-20 18:31 ` Bill Huey
2005-06-22 16:00   ` Karim Yaghmour
2005-06-22 19:29     ` Bill Huey
2005-06-22 20:05       ` Ingo Molnar
2005-06-22 20:39         ` Karim Yaghmour
2005-06-22 22:04           ` Ingo Molnar
2005-06-22 23:03             ` Lee Revell
2005-06-22 23:52               ` Karim Yaghmour
2005-06-22 23:38             ` Karim Yaghmour
2005-06-22 23:57               ` Andrea Arcangeli
2005-06-23  0:05               ` Daniel Walker
2005-06-23  0:48                 ` Karim Yaghmour
2005-06-23  0:06               ` Ingo Molnar
2005-06-23  0:47                 ` Karim Yaghmour
2005-06-23  0:55                   ` Bill Huey
2005-06-23  1:09                     ` Karim Yaghmour
2005-06-23  1:15                       ` Bill Huey
2005-06-23  1:47                         ` Karim Yaghmour
2005-06-23  0:59                   ` David Lang
2005-06-23  1:22                     ` Karim Yaghmour
2005-06-23  1:42                       ` David Lang
2005-06-23  2:09                         ` Karim Yaghmour
2005-06-23  2:15                           ` David Lang
2005-06-23  1:34                   ` Ingo Molnar
2005-06-23  2:02                     ` Karim Yaghmour
2005-06-23  3:57                       ` Lee Revell
2005-06-23  4:13                         ` Karim Yaghmour
2005-06-22 20:10       ` Karim Yaghmour [this message]
2005-06-22 20:15         ` Bill Huey
2005-06-21  1:55 ` Paul E. McKenney
2005-06-21  2:29   ` Karim Yaghmour
2005-06-22  1:19     ` Paul E. McKenney
2005-06-22 15:31       ` Karim Yaghmour
2005-06-22 15:27         ` Kristian Benoit
2005-06-22 16:27         ` Paul E. McKenney
2005-06-22 17:20           ` Kristian Benoit
2005-06-22 17:34             ` Ingo Molnar
2005-06-22 17:40               ` Ingo Molnar
2005-06-22 18:12                 ` Karim Yaghmour
2005-06-22 18:14                   ` Ingo Molnar
2005-06-22 19:04                     ` Karim Yaghmour
2005-06-22 18:50             ` Paul E. McKenney
2005-06-22 19:04               ` Ingo Molnar
2005-06-22 20:17                 ` Karim Yaghmour
2005-06-22 20:22                   ` Ingo Molnar
2005-06-22 21:03                     ` Karim Yaghmour
2005-06-22 21:10                       ` Ingo Molnar
2005-06-22 21:32                         ` Karim Yaghmour
2005-06-22 22:41                       ` Ingo Molnar
2005-06-22 23:02                         ` Karim Yaghmour
2005-06-22 21:20                 ` Paul E. McKenney
2005-06-22 19:08               ` Karim Yaghmour
2005-06-23 14:48             ` Paulo Marques
2005-06-22 17:58           ` Karim Yaghmour
2005-06-22 18:47             ` Paul E. McKenney
2005-06-22 19:16               ` Karim Yaghmour
2005-06-22 21:23                 ` Paul E. McKenney
2005-06-22 17:17         ` Lee Revell
2005-06-22 17:32           ` Karim Yaghmour
2005-06-29  7:43           ` PREEMPT_RT & threading IRQ 0 Ingo Molnar

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