From: Ingo Molnar <mingo@elte.hu>
To: Mark_H_Johnson@raytheon.com
Cc: Amit Shah <amit.shah@codito.com>,
Karsten Wiese <annabellesgarden@yahoo.de>,
Bill Huey <bhuey@lnxw.com>, Adam Heath <doogie@debian.org>,
emann@mrv.com, Gunther Persoons <gunther_persoons@spymac.com>,
"K.R. Foley" <kr@cybsft.com>,
linux-kernel@vger.kernel.org,
Florian Schmidt <mista.tapas@gmx.net>,
Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
Lee Revell <rlrevell@joe-job.com>,
Rui Nuno Capela <rncbc@rncbc.org>,
Shane Shrybman <shrybman@aei.ca>,
Esben Nielsen <simlo@phys.au.dk>,
Thomas Gleixner <tglx@linutronix.de>,
Michal Schmidt <xschmi00@stud.feec.vutbr.cz>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.32-0
Date: Tue, 7 Dec 2004 15:07:33 +0100 [thread overview]
Message-ID: <20041207140733.GA10072@elte.hu> (raw)
In-Reply-To: <OF17EC3728.49FC8C3C-ON86256F62.00576C16@raytheon.com>
* Mark_H_Johnson@raytheon.com <Mark_H_Johnson@raytheon.com> wrote:
> > It is easy to hack the scheduler to fix some RT issue but break the
> > generic scheduler - this solution is not meant to be such a hack.
>
> I agree but I see the big delay of running the RT task to be a symptom
> that the current non RT scheduler is somehow broken. I've reported the
> non RT starvation condition several times. Yes, the second CPU is
> busy, but I really do want to bump cpu_burn (which is non RT & nice)
> to run my (non RT and not nice) stress script / commands instead.
well ... doing global balancing on SMP gets really expensive, really
quick. It's simply not an option for 4 way or higher, and even on 2-way
it's measurable. In the RT case arguably latency is more important than
throughput, but i dont think the same case could be made for nice vs.
non-nice.
Ingo
next prev parent reply other threads:[~2004-12-07 14:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-06 15:59 [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.32-0 Mark_H_Johnson
2004-12-07 14:07 ` Ingo Molnar [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-12-06 14:40 Mark_H_Johnson
2004-12-06 15:34 ` Ingo Molnar
2004-12-03 22:33 Mark_H_Johnson
2004-11-11 21:51 [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1 Ingo Molnar
2004-11-16 12:54 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-0 Ingo Molnar
2004-11-16 13:09 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-1 Ingo Molnar
2004-11-16 13:40 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-3 Ingo Molnar
2004-11-17 12:42 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.28-0 Ingo Molnar
2004-11-18 12:35 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.28-1 Ingo Molnar
2004-11-18 16:46 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.29-0 Ingo Molnar
2004-11-22 0:54 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-2 Ingo Molnar
2004-11-23 17:58 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-9 Ingo Molnar
2004-11-24 10:16 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-10 Ingo Molnar
2004-12-03 20:58 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.32-0 Ingo Molnar
2004-12-03 21:04 ` Ingo Molnar
2004-12-04 22:32 ` Rui Nuno Capela
2004-12-04 22:46 ` Ingo Molnar
2004-12-04 23:38 ` Rui Nuno Capela
2004-12-04 23:55 ` K.R. Foley
2004-12-05 3:10 ` Gene Heskett
2004-12-05 3:05 ` Gene Heskett
2004-12-05 23:14 ` Esben Nielsen
2004-12-06 13:14 ` Ingo Molnar
2004-12-06 15:01 ` Esben Nielsen
2004-12-06 15:27 ` Ingo Molnar
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