From: Lee Revell <rlrevell@joe-job.com>
To: Esben Nielsen <simlo@phys.au.dk>
Cc: Mark_H_Johnson@raytheon.com,
Florian Schmidt <mista.tapas@gmx.net>,
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, Ingo Molnar <mingo@elte.hu>,
Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
Rui Nuno Capela <rncbc@rncbc.org>,
Shane Shrybman <shrybman@aei.ca>,
Thomas Gleixner <tglx@linutronix.de>,
Michal Schmidt <xschmi00@stud.feec.vutbr.cz>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6
Date: Thu, 09 Dec 2004 15:16:13 -0500 [thread overview]
Message-ID: <1102623373.21688.6.camel@krustophenia.net> (raw)
In-Reply-To: <Pine.OSF.4.05.10412091907430.4626-100000@da410.ifa.au.dk>
On Thu, 2004-12-09 at 20:04 +0100, Esben Nielsen wrote:
> IRQ threading makes the system more predictable but for many, many
> devices it is very expensive. I am predicting that many interrupt routines
> have to be turned back to running in interrupt context.
It's important to keep in mind that for the type of applications that
would want PREEMPT_DESKTOP, the IRQ threading is only necessary because
of the amount of work the IDE subsystem does in hardirq context. There
was some discussion a while back and Jens posted a patch to move the IDE
IO completion to a softirq. IIRC there was not a lot of comment on it.
But, it seems to me that this approach would give the most favorable
balance of performance and low latency for many uses. My tests show
that with softirq preemption this should allow jackd to run at 64 frames
or so without IRQ threading.
Lee
next prev parent reply other threads:[~2004-12-09 20:16 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-09 16:56 [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6 Mark_H_Johnson
2004-12-09 17:28 ` Ingo Molnar
2004-12-09 17:41 ` Ingo Molnar
2004-12-09 18:26 ` Ingo Molnar
2004-12-09 19:04 ` Esben Nielsen
2004-12-09 19:58 ` john cooper
2004-12-09 20:16 ` Lee Revell [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-12-13 14:10 Mark_H_Johnson
2004-12-09 21:58 Mark_H_Johnson
2004-12-09 22:55 ` Ingo Molnar
2004-12-09 20:49 Mark_H_Johnson
2004-12-09 21:56 ` Ingo Molnar
2004-12-09 20:38 Mark_H_Johnson
2004-12-09 19:54 Mark_H_Johnson
2004-12-09 19:23 Mark_H_Johnson
2004-12-09 20:04 ` Ingo Molnar
2004-12-10 5:01 ` Bill Huey
2004-12-10 5:14 ` Steven Rostedt
2004-12-10 5:58 ` Bill Huey
2004-12-09 18:15 Mark_H_Johnson
2004-12-09 20:11 ` Ingo Molnar
2004-12-09 18:10 Mark_H_Johnson
2004-12-09 19:40 ` Ingo Molnar
2004-12-09 19:58 ` Ingo Molnar
2004-12-10 23:42 ` Steven Rostedt
2004-12-11 16:59 ` john cooper
2004-12-12 4:36 ` Steven Rostedt
2004-12-13 23:45 ` john cooper
2004-12-14 13:01 ` Steven Rostedt
2004-12-14 14:28 ` john cooper
2004-12-14 16:53 ` Steven Rostedt
2004-12-11 17:59 ` Esben Nielsen
2004-12-11 18:59 ` Steven Rostedt
2004-12-11 19:50 ` Esben Nielsen
2004-12-11 22:34 ` Steven Rostedt
2004-12-13 21:55 ` Bill Huey
2004-12-13 22:15 ` Steven Rostedt
2004-12-13 22:20 ` Ingo Molnar
2004-12-13 22:31 ` Ingo Molnar
2004-12-09 17:22 Mark_H_Johnson
2004-12-09 17:31 ` Ingo Molnar
2004-12-09 20:34 ` K.R. Foley
2004-12-09 22:06 ` Ingo Molnar
2004-12-09 23:16 ` K.R. Foley
2004-12-10 4:26 ` K.R. Foley
2004-12-10 11:22 ` Ingo Molnar
2004-12-10 15:26 ` K.R. Foley
2004-12-09 15:16 Mark_H_Johnson
2004-12-09 16:17 ` Florian Schmidt
2004-12-09 17:13 ` Ingo Molnar
2004-12-09 14:46 Mark_H_Johnson
2004-12-09 14:14 Mark_H_Johnson
2004-12-07 21:41 Mark_H_Johnson
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
2004-12-07 13:29 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-4 Ingo Molnar
2004-12-07 14:11 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6 Ingo Molnar
2004-12-08 4:31 ` K.R. Foley
2004-12-08 8:34 ` Ingo Molnar
2004-12-08 16:07 ` K.R. Foley
2004-12-08 16:18 ` Lee Revell
2004-12-08 16:52 ` K.R. Foley
2004-12-08 16:58 ` Lee Revell
2004-12-09 9:02 ` Ingo Molnar
2004-12-09 2:45 ` K.R. Foley
2004-12-09 12:11 ` Ingo Molnar
2004-12-09 14:50 ` K.R. Foley
2004-12-08 17:13 ` Steven Rostedt
2004-12-08 18:14 ` Rui Nuno Capela
2004-12-08 19:03 ` Steven Rostedt
2004-12-08 21:39 ` Rui Nuno Capela
2004-12-08 22:11 ` Steven Rostedt
2004-12-09 9:32 ` Ingo Molnar
2004-12-09 13:36 ` Steven Rostedt
2004-12-09 9:06 ` Ingo Molnar
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