From: Ingo Molnar <mingo@elte.hu>
To: Andi Kleen <ak@muc.de>
Cc: Takashi Iwai <tiwai@suse.de>,
Sven-Thorsten Dietrich <sdietrich@mvista.com>,
dwalker@mvista.com, bhuey@lnxw.com, nickpiggin@yahoo.com.au,
hch@infradead.org, akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: RT patch acceptance
Date: Mon, 30 May 2005 12:33:47 +0200 [thread overview]
Message-ID: <20050530103347.GA13425@elte.hu> (raw)
In-Reply-To: <20050530095349.GK86087@muc.de>
* Andi Kleen <ak@muc.de> wrote:
> > Yes, as Ingo stated many times, addition cond_resched() to
> > might_sleep() does achieve the "usable" latencies -- and obviously
> > that's hacky.
>
> But it's the only way to get practial(1)low latency benefit to
> everybody - not just a few selected few who know how to set the right
> kernel options or do other incarnations and willfully give up
> performance and stability.
>
> It is basically similar to why we often avoid kernel tunables - the
> kernel must work well out of the box.
>
> (1) = not necessarily provable, but good enough at least for jack
> et.al.
FYI, to get good latencies for jack you currently need the -RT tree and
CONFIG_PREEMPT. (see Lee Revell's and Rui Nuno Capela's extensive tests)
In other words, cond_resched() in might_sleep() (PREEMPT_VOLUNTARY,
which i announced Jul 9 last year) is _not_ good enough for
advanced-audio (jack) users. PREEMPT_VOLUNTARY is mostly good enough for
simple audio playback / gaming.
Ingo
next prev parent reply other threads:[~2005-05-30 10:36 UTC|newest]
Thread overview: 345+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-23 23:14 RT patch acceptance Daniel Walker
2005-05-24 2:01 ` john cooper
2005-05-24 5:47 ` Christoph Hellwig
2005-05-24 6:45 ` Ingo Molnar
2005-05-24 8:03 ` Nick Piggin
2005-05-24 8:15 ` Ingo Molnar
2005-05-24 8:27 ` Nick Piggin
2005-05-24 9:02 ` Ingo Molnar
2005-05-24 9:14 ` Nick Piggin
2005-05-24 10:13 ` Ingo Molnar
2005-05-24 18:05 ` Daniel Walker
2005-05-24 22:41 ` Bill Huey
2005-05-24 23:44 ` Daniel Walker
2005-05-25 0:10 ` Bill Huey
2005-05-25 0:32 ` K.R. Foley
2005-05-25 0:45 ` Lee Revell
2005-05-25 1:32 ` K.R. Foley
2005-05-25 0:45 ` Daniel Walker
2005-05-25 0:59 ` Bill Huey
2005-05-25 1:02 ` Daniel Walker
2005-05-25 1:43 ` Andrew Morton
2005-05-25 2:02 ` Sven Dietrich
2005-05-25 2:20 ` Andrew Morton
2005-05-25 2:26 ` Lee Revell
2005-05-25 3:24 ` Nick Piggin
2005-05-25 3:36 ` Sven Dietrich
2005-05-25 5:05 ` Nick Piggin
2005-05-25 6:09 ` RT patch acceptance (scheduler) Bill Huey
2005-05-25 7:00 ` Nick Piggin
2005-05-25 9:27 ` Bill Huey
2005-05-25 14:50 ` Nick Piggin
2005-05-25 15:12 ` RT patch acceptance (scheduler) --- QUESTION Brian O'Mahoney
2005-05-25 15:36 ` Steven Rostedt
2005-05-25 6:05 ` RT patch acceptance Ingo Molnar
2005-05-25 18:50 ` Lee Revell
2005-05-25 3:26 ` Gene Heskett
2005-05-25 5:17 ` Nick Piggin
2005-05-25 13:20 ` Gene Heskett
2005-05-25 6:33 ` Ingo Molnar
2005-05-25 7:18 ` Nick Piggin
2005-05-25 7:46 ` Ingo Molnar
2005-05-25 10:51 ` Con Kolivas
2005-05-25 8:29 ` Giuseppe Bilotta
2005-05-25 13:23 ` Gene Heskett
2005-05-25 17:17 ` Andi Kleen
2005-05-25 17:52 ` Steven Rostedt
2005-05-25 18:00 ` Sven-Thorsten Dietrich
2005-05-26 19:32 ` Andi Kleen
2005-05-26 20:11 ` Sven-Thorsten Dietrich
2005-05-26 20:27 ` Andi Kleen
2005-05-26 20:46 ` Sven-Thorsten Dietrich
2005-05-26 23:57 ` john cooper
2005-05-26 21:28 ` Bill Huey
2005-05-26 23:44 ` john cooper
2005-05-27 5:19 ` Nick Piggin
2005-05-27 5:24 ` Nick Piggin
2005-05-27 7:18 ` Ingo Molnar
2005-05-27 8:07 ` Nick Piggin
2005-05-27 15:56 ` K.R. Foley
2005-05-28 3:59 ` Lee Revell
2005-05-27 7:20 ` Sven-Thorsten Dietrich
2005-05-27 8:17 ` Nick Piggin
2005-05-27 10:17 ` Thomas Gleixner
2005-05-27 17:46 ` Karim Yaghmour
2005-05-27 12:08 ` Bill Huey
2005-05-27 12:10 ` Ingo Molnar
2005-05-27 20:36 ` Bill Huey
2005-05-27 12:43 ` Nick Piggin
2005-05-27 23:36 ` Bill Huey
2005-05-28 3:53 ` Nick Piggin
2005-05-28 4:27 ` Lee Revell
2005-05-28 4:43 ` Nick Piggin
2005-05-28 5:53 ` Bill Huey
2005-05-28 5:45 ` Bill Huey
2005-05-28 6:49 ` Nick Piggin
2005-05-29 11:37 ` James Bruce
2005-05-29 12:23 ` Brian O'Mahoney
2005-05-30 9:37 ` Nick Piggin
2005-05-30 13:43 ` James Bruce
2005-05-30 14:21 ` Nick Piggin
2005-05-30 22:27 ` Bill Huey
2005-05-30 22:54 ` Karim Yaghmour
2005-05-30 23:05 ` Bill Huey
2005-05-30 23:29 ` Karim Yaghmour
2005-05-31 1:21 ` Nick Piggin
2005-05-31 2:09 ` Bill Huey
2005-05-31 9:12 ` James Bruce
2005-05-31 9:33 ` Nick Piggin
2005-05-31 10:23 ` Bill Huey
2005-05-31 10:48 ` James Bruce
2005-05-31 11:06 ` Nick Piggin
2005-05-31 11:14 ` Andi Kleen
2005-05-31 11:31 ` Hari N
2005-05-31 16:59 ` James Bruce
2005-05-31 12:09 ` Esben Nielsen
2005-05-31 16:18 ` Steven Rostedt
2005-05-31 16:42 ` Esben Nielsen
2005-05-31 17:11 ` Andrea Arcangeli
2005-05-31 17:42 ` Steven Rostedt
2005-05-31 17:51 ` Andrea Arcangeli
2005-05-31 18:29 ` Steven Rostedt
2005-05-31 20:54 ` Andrea Arcangeli
2005-05-31 21:22 ` Steven Rostedt
2005-05-31 21:47 ` Lee Revell
2005-05-31 22:24 ` Andrea Arcangeli
2005-05-31 23:41 ` Steven Rostedt
2005-06-01 0:50 ` Zan Lynx
2005-06-01 2:38 ` Zwane Mwaikambo
2005-05-31 22:15 ` Andrea Arcangeli
2005-05-31 22:33 ` NZG
2005-05-31 23:14 ` Bill Huey
2005-05-31 21:33 ` Bill Huey
2005-05-31 23:59 ` Steven Rostedt
2005-06-01 0:57 ` Brian O'Mahoney
2005-06-01 6:23 ` John Alvord
2005-06-01 11:41 ` Steven Rostedt
2005-06-01 0:26 ` Peter Chubb
2005-06-01 8:17 ` Esben Nielsen
2005-05-31 14:30 ` Andrea Arcangeli
2005-05-31 15:07 ` Esben Nielsen
2005-05-31 16:11 ` Andrea Arcangeli
2005-05-31 18:36 ` Paul E. McKenney
2005-05-31 20:45 ` Andrea Arcangeli
2005-06-01 1:14 ` Karim Yaghmour
2005-06-01 1:30 ` Steven Rostedt
2005-06-01 1:50 ` Karim Yaghmour
2005-06-01 2:42 ` Paul E. McKenney
2005-06-01 12:18 ` Paulo Marques
2005-06-01 13:51 ` Andrea Arcangeli
2005-06-01 14:19 ` Ingo Molnar
2005-06-01 14:32 ` Andrea Arcangeli
2005-06-01 14:39 ` Daniel Walker
2005-06-01 14:45 ` Ingo Molnar
2005-06-01 14:57 ` Andrea Arcangeli
2005-06-01 14:45 ` Esben Nielsen
2005-06-01 15:05 ` Andrea Arcangeli
2005-06-01 15:15 ` Esben Nielsen
2005-06-01 15:32 ` Andrea Arcangeli
2005-06-01 17:30 ` pi_test predicted results Daniel Walker
2005-06-01 17:58 ` Esben Nielsen
2005-06-01 15:33 ` RT patch acceptance Karim Yaghmour
2005-06-01 15:38 ` Andrea Arcangeli
2005-06-01 17:53 ` Thomas Gleixner
2005-06-01 19:22 ` Andrea Arcangeli
2005-06-01 19:34 ` Esben Nielsen
2005-06-01 19:59 ` Andrea Arcangeli
2005-06-01 20:17 ` Bill Huey
2005-06-01 20:32 ` Andrea Arcangeli
2005-06-01 20:46 ` Bill Huey
2005-06-01 21:07 ` Andrea Arcangeli
2005-06-01 21:29 ` Nicolas Pitre
2005-06-01 21:39 ` Andrea Arcangeli
2005-06-01 22:29 ` Nicolas Pitre
2005-06-01 23:44 ` Zwane Mwaikambo
2005-06-01 21:42 ` Bill Huey
2005-06-01 21:59 ` Bill Huey
2005-06-01 22:32 ` Andrea Arcangeli
2005-06-01 23:02 ` Bill Huey
2005-06-01 23:19 ` Bill Huey
2005-06-02 8:50 ` Esben Nielsen
2005-06-01 23:59 ` Bill Huey
2005-06-02 0:03 ` Bill Huey
2005-06-01 19:39 ` Ingo Molnar
2005-06-01 20:44 ` Andrea Arcangeli
2005-06-01 20:56 ` Thomas Gleixner
2005-06-01 21:09 ` Andrea Arcangeli
2005-06-01 14:46 ` Andrea Arcangeli
2005-06-01 14:56 ` Chris Friesen
2005-06-01 14:58 ` Paulo Marques
2005-06-01 15:17 ` Andrea Arcangeli
2005-06-01 15:33 ` john cooper
2005-06-01 15:43 ` Andrea Arcangeli
2005-06-01 15:19 ` Karim Yaghmour
2005-06-01 14:59 ` Esben Nielsen
2005-06-01 15:47 ` NZG
2005-06-01 15:58 ` Andrea Arcangeli
2005-06-01 17:20 ` Bill Davidsen
2005-06-01 18:19 ` Esben Nielsen
2005-06-01 15:09 ` Karim Yaghmour
2005-05-31 9:14 ` Esben Nielsen
2005-05-30 23:32 ` James Bruce
2005-05-31 1:22 ` Nick Piggin
2005-05-31 2:06 ` Lee Revell
2005-05-31 2:26 ` Lee Revell
2005-05-31 7:34 ` James Bruce
2005-05-31 19:10 ` Elladan
2005-05-30 22:10 ` Bill Huey
2005-05-30 17:53 ` Karim Yaghmour
2005-05-30 19:24 ` Esben Nielsen
2005-05-30 19:44 ` Karim Yaghmour
2005-05-30 21:44 ` Rich Walker
2005-05-30 22:45 ` Bill Huey
2005-05-30 23:03 ` Karim Yaghmour
2005-05-30 23:12 ` Bill Huey
2005-05-30 23:31 ` Karim Yaghmour
2005-05-31 0:00 ` Karim Yaghmour
2005-05-30 11:25 ` Nick Piggin
2005-05-29 1:55 ` Zwane Mwaikambo
2005-05-29 2:48 ` Lee Revell
2005-05-29 2:58 ` Zwane Mwaikambo
2005-05-29 4:08 ` Valdis.Kletnieks
2005-05-29 15:00 ` Zwane Mwaikambo
2005-05-29 17:50 ` Valdis.Kletnieks
2005-05-29 19:52 ` Zwane Mwaikambo
2005-05-29 21:16 ` Valdis.Kletnieks
2005-05-30 13:01 ` Bill Huey
2005-05-31 14:30 ` Zwane Mwaikambo
2005-05-28 6:55 ` Christoph Hellwig
2005-05-28 10:22 ` Bill Huey
2005-05-28 10:24 ` Christoph Hellwig
2005-05-28 10:36 ` Bill Huey
2005-05-28 10:34 ` Bill Huey
2005-05-28 10:50 ` Bill Huey
2005-05-28 10:48 ` Christoph Hellwig
2005-05-28 11:01 ` Bill Huey
2005-05-28 11:32 ` Bill Huey
2005-05-27 9:03 ` Thomas Gleixner
2005-05-27 9:14 ` Ingo Molnar
2005-05-27 9:22 ` Thomas Gleixner
2005-06-14 0:48 ` Daniel Walker
2005-06-14 3:29 ` Valdis.Kletnieks
2005-06-14 3:38 ` Daniel Walker
2005-05-26 20:38 ` john cooper
2005-05-26 21:00 ` Sven-Thorsten Dietrich
2005-05-26 21:23 ` john cooper
2005-05-26 20:52 ` Bill Huey
2005-05-26 21:09 ` Sven-Thorsten Dietrich
2005-05-26 21:14 ` Sven-Thorsten Dietrich
[not found] ` <20050526200424.GA27162@elte.hu>
[not found] ` <20050527123529.GD86087@muc.de>
2005-05-27 12:48 ` Ingo Molnar
2005-05-27 12:56 ` Andi Kleen
2005-05-27 13:13 ` Ingo Molnar
2005-05-27 13:31 ` Andi Kleen
2005-05-27 13:44 ` Ingo Molnar
2005-05-27 13:50 ` Ingo Molnar
2005-05-27 13:53 ` Ingo Molnar
2005-05-28 19:55 ` Andi Kleen
2005-05-28 20:57 ` Lee Revell
2005-05-27 13:56 ` Takashi Iwai
2005-05-27 14:27 ` Duncan Sands
2005-05-27 16:35 ` Andrea Arcangeli
2005-05-30 9:53 ` Andi Kleen
2005-05-30 10:33 ` Ingo Molnar [this message]
2005-05-30 10:56 ` Andi Kleen
2005-05-30 12:10 ` what is the -RT tree Ingo Molnar
2005-05-30 12:40 ` Andi Kleen
2005-05-30 13:30 ` Bill Huey
2005-05-31 16:18 ` Sven-Thorsten Dietrich
2005-05-30 11:15 ` RT patch acceptance Thomas Gleixner
2005-05-27 13:34 ` Ingo Molnar
2005-05-25 3:48 ` john cooper
2005-05-25 11:35 ` Esben Nielsen
2005-05-25 13:14 ` john cooper
2005-05-25 6:09 ` Ingo Molnar
2005-05-25 1:05 ` Bill Huey
2005-05-25 2:37 ` Karim Yaghmour
2005-05-25 2:36 ` Sven Dietrich
2005-05-25 2:56 ` Karim Yaghmour
2005-05-25 3:05 ` Chris Friesen
2005-05-25 19:24 ` Tim Bird
2005-05-25 2:38 ` Lee Revell
2005-05-25 2:58 ` Karim Yaghmour
2005-05-25 2:51 ` Sven Dietrich
2005-05-25 6:15 ` Bill Huey
2005-05-25 13:25 ` Karim Yaghmour
2005-05-25 8:16 ` Ingo Molnar
2005-05-25 13:27 ` Karim Yaghmour
2005-05-25 17:32 ` Sven-Thorsten Dietrich
2005-05-25 18:16 ` Chris Friesen
2005-05-27 2:29 ` Steven Rostedt
2005-05-25 16:01 ` Jonathan Corbet
2005-05-24 11:22 ` K.R. Foley
2005-05-24 15:21 ` Nick Piggin
2005-05-24 15:41 ` K.R. Foley
2005-05-24 17:31 ` Daniel Walker
2005-05-24 15:56 ` Ingo Molnar
2005-05-24 23:21 ` Bill Huey
2005-05-24 15:44 ` Daniel Walker
2005-05-24 15:47 ` Ingo Molnar
2005-05-24 16:27 ` john cooper
2005-05-24 18:01 ` Daniel Walker
2005-05-24 9:38 ` Esben Nielsen
2005-05-24 13:29 ` Karim Yaghmour
2005-05-24 13:58 ` Esben Nielsen
2005-05-24 14:42 ` Karim Yaghmour
2005-05-24 15:23 ` Ingo Molnar
2005-05-24 16:17 ` Karim Yaghmour
2005-05-24 21:23 ` Sven Dietrich
2005-05-24 22:31 ` Karim Yaghmour
2005-05-24 22:54 ` Sven Dietrich
2005-05-24 23:41 ` Lee Revell
[not found] ` <1116979434.2912.63.camel@mindpipe>
2005-05-25 0:48 ` Karim Yaghmour
2005-05-24 23:46 ` Lee Revell
2005-05-25 3:38 ` Gene Heskett
2005-05-24 23:49 ` Bill Huey
2005-05-25 14:26 ` Philippe Gerum
2005-05-24 14:47 ` Gene Heskett
2005-05-24 17:22 ` Philippe Gerum
2005-05-25 0:21 ` Lee Revell
2005-05-25 2:04 ` Sven Dietrich
2005-05-25 20:58 ` Tom Vier
2005-05-25 21:05 ` Esben Nielsen
2005-05-25 21:10 ` NZG
2005-05-25 21:25 ` Tom Vier
2005-05-25 21:43 ` Esben Nielsen
2005-05-25 21:45 ` Bill Huey
2005-05-25 21:43 ` Bill Huey
-- strict thread matches above, loose matches on Subject: below --
2005-05-25 6:55 kus Kusche Klaus
2005-05-25 7:06 ` Nick Piggin
2005-05-25 7:58 kus Kusche Klaus
2005-06-01 17:56 ` Paul G. Allen
2005-05-25 18:10 YhLu
2005-05-25 18:51 ` Andi Kleen
2005-05-30 8:25 kus Kusche Klaus
2005-05-30 9:49 ` Nick Piggin
2005-05-30 10:16 kus Kusche Klaus
2005-05-30 10:43 ` Nick Piggin
2005-05-30 11:34 ` Esben Nielsen
2005-05-30 11:58 ` Nick Piggin
2005-05-30 18:26 ` Steven Rostedt
2005-05-30 18:37 ` Esben Nielsen
2005-05-30 18:56 ` Karim Yaghmour
2005-05-30 18:58 ` Karim Yaghmour
2005-05-30 19:33 ` Esben Nielsen
2005-05-30 19:46 ` Karim Yaghmour
2005-05-30 20:00 ` Karim Yaghmour
2005-05-31 8:53 ` Esben Nielsen
2005-05-31 22:01 ` Bill Huey
2005-06-01 0:38 ` Karim Yaghmour
2005-05-30 22:34 ` Bill Huey
2005-05-30 22:49 ` Karim Yaghmour
2005-05-30 22:49 ` Bill Huey
2005-05-30 23:15 ` Karim Yaghmour
2005-05-31 0:07 ` Thomas Gleixner
2005-05-31 16:29 ` Steven Rostedt
2005-05-31 19:52 ` Lee Revell
2005-05-31 20:16 ` Steven Rostedt
2005-05-31 21:36 ` Bill Huey
2005-05-31 19:55 ` Lee Revell
2005-05-31 20:01 ` Andi Kleen
2005-05-31 20:10 ` Lee Revell
2005-05-31 20:14 ` David Lang
2005-06-01 2:06 ` Andrea Arcangeli
2005-06-01 2:13 ` David Lang
2005-05-30 16:33 ` Zwane Mwaikambo
2005-05-31 4:39 Saksena, Manas
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