From: "Stephen D. Williams" <sdw@lig.net>
To: Andi Kleen <ak@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Mark Salisbury <mbs@mc.com>,
Jeff Dike <jdike@karaya.com>,
schwidefsky@de.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: No 100 HZ timer !
Date: Tue, 10 Apr 2001 14:45:15 -0400 [thread overview]
Message-ID: <3AD354BB.20F1CE33@lig.net> (raw)
In-Reply-To: <20010410140202.A15114@gruyere.muc.suse.de> <E14mx0K-00049P-00@the-village.bc.nu> <20010410143216.A15880@gruyere.muc.suse.de>
When this is rewritten, I would strongly suggest that we find a way to
make 'gettimeofday' nearly free. Certain applications need to use this
frequently while still being portable. One solution when you do have
clock ticks is a read-only mapped Int. Another cheap solution is
library assembly that adds a cycle clock delta since last system call to
a 'gettimeofday' value set on every system call return.
sdw
Andi Kleen wrote:
>
> On Tue, Apr 10, 2001 at 01:12:14PM +0100, Alan Cox wrote:
> > Measure the number of clocks executing a timer interrupt. rdtsc is fast. Now
> > consider the fact that out of this you get KHz or better scheduling
> > resolution required for games and midi. I'd say it looks good. I agree
>
> And measure the number of cycles a gigahertz CPU can do between a 1ms timer.
> And then check how often the typical application executes something like
> gettimeofday.
>
...
sdw
--
sdw@lig.net http://sdw.st
Stephen D. Williams
43392 Wayside Cir,Ashburn,VA 20147-4622 703-724-0118W 703-995-0407Fax
Dec2000
next prev parent reply other threads:[~2001-04-10 19:46 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-09 15:54 No 100 HZ timer ! schwidefsky
2001-04-09 18:30 ` Jeff Dike
2001-04-09 18:19 ` Mark Salisbury
2001-04-09 20:12 ` Alan Cox
2001-04-09 20:32 ` Mark Salisbury
2001-04-09 22:31 ` Mikulas Patocka
2001-04-09 22:35 ` Alan Cox
2001-04-10 11:43 ` David Schleef
2001-04-10 12:04 ` Mikulas Patocka
2001-04-10 12:31 ` David Schleef
2001-04-10 12:34 ` Mark Salisbury
2001-04-10 14:10 ` Mikulas Patocka
2001-04-10 13:35 ` root
2001-04-10 14:22 ` Andi Kleen
2001-04-10 15:43 ` Alan Cox
2001-04-12 5:25 ` watermodem
2001-04-12 8:45 ` Jamie Lokier
2001-04-10 17:15 ` Jamie Lokier
2001-04-10 17:27 ` Alan Cox
2001-04-10 17:35 ` Jamie Lokier
2001-04-10 18:17 ` Alan Cox
2001-04-10 18:24 ` Jamie Lokier
2001-04-10 19:28 ` george anzinger
2001-04-10 20:02 ` mark salisbury
2001-04-10 22:08 ` george anzinger
2001-04-11 0:48 ` Mark Salisbury
2001-04-11 2:35 ` george anzinger
2001-04-12 0:24 ` Mark Salisbury
2001-04-11 16:11 ` Jamie Lokier
2001-04-11 16:59 ` george anzinger
2001-04-11 18:57 ` Jamie Lokier
2001-04-11 19:21 ` John Alvord
2001-04-12 8:41 ` Jamie Lokier
2001-08-01 1:08 ` george anzinger
2001-08-11 11:57 ` Pavel Machek
2001-08-14 15:59 ` Jamie Lokier
2001-08-14 16:57 ` george anzinger
2001-04-10 19:50 ` Zdenek Kabelac
2001-04-11 11:42 ` Maciej W. Rozycki
2001-04-11 16:13 ` Jamie Lokier
2001-04-12 9:51 ` Maciej W. Rozycki
2001-04-10 19:42 ` Zdenek Kabelac
2001-04-10 12:19 ` Mark Salisbury
2001-04-10 17:51 ` yodaiken
2001-04-11 18:43 ` Oliver Xymoron
2001-04-10 12:11 ` Mark Salisbury
2001-04-10 5:51 ` Andi Kleen
2001-04-10 9:33 ` Martin Mares
2001-04-10 10:00 ` Albert D. Cahalan
2001-04-10 12:14 ` Mark Salisbury
2001-04-11 5:55 ` Karim Yaghmour
2001-04-10 11:18 ` Alan Cox
2001-04-10 12:02 ` Andi Kleen
2001-04-10 12:12 ` Alan Cox
2001-04-10 12:27 ` Mark Salisbury
2001-04-10 12:32 ` Andi Kleen
2001-04-10 12:36 ` Alan Cox
2001-04-10 12:37 ` Andi Kleen
2001-04-10 18:45 ` Stephen D. Williams [this message]
2001-04-10 19:59 ` Andi Kleen
2001-04-10 12:07 ` Mark Salisbury
2001-04-10 12:45 ` Andi Kleen
2001-04-10 12:42 ` Mark Salisbury
2001-04-10 12:54 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2001-04-10 7:27 schwidefsky
2001-04-10 7:29 schwidefsky
2001-04-10 11:38 schwidefsky
2001-04-10 11:54 ` Alan Cox
2001-04-10 12:54 schwidefsky
2001-04-10 14:42 schwidefsky
2001-04-11 9:06 schwidefsky
2001-04-11 17:56 No 100 HZ timer! Bret Indrelee
2001-04-12 17:39 ` george anzinger
2001-04-12 21:19 ` Bret Indrelee
2001-04-12 22:20 ` george anzinger
2001-04-13 4:00 ` Bret Indrelee
2001-04-13 6:32 ` Ben Greear
2001-04-13 8:42 ` george anzinger
2001-04-13 10:36 ` Jamie Lokier
2001-04-13 16:07 ` george anzinger
2001-04-13 23:00 ` Jamie Lokier
2001-04-13 12:05 ` Horst von Brand
2001-04-13 21:53 ` george anzinger
2001-04-13 23:10 ` Jamie Lokier
2001-04-16 3:02 ` Ben Greear
2001-04-16 2:46 ` Jamie Lokier
2001-04-16 12:36 ` Mark Salisbury
2001-04-16 19:19 ` george anzinger
2001-04-16 20:45 ` Albert D. Cahalan
2001-04-16 21:29 ` Chris Wedgwood
2001-04-16 22:25 ` george anzinger
2001-04-16 23:57 ` Mark Salisbury
2001-04-17 0:45 ` george anzinger
2001-04-17 12:12 ` Mark Salisbury
2001-04-17 12:51 ` Mark Salisbury
2001-04-17 18:53 ` george anzinger
2001-04-17 19:41 ` Jamie Lokier
2001-04-23 8:05 ` Ulrich Windl
2001-04-23 13:22 ` Mark Salisbury
2001-04-16 2:41 ` Ben Greear
2001-04-12 12:58 No 100 HZ timer ! Mark Salisbury
2001-04-12 13:14 No 100 HZ timer! Bret Indrelee
2001-08-01 17:22 No 100 HZ timer ! george anzinger
2001-08-01 19:34 ` Chris Friesen
2001-08-01 19:49 ` Richard B. Johnson
2001-08-01 20:08 ` Mark Salisbury
2001-08-01 20:33 ` george anzinger
2001-08-01 21:20 ` george anzinger
2001-08-02 4:28 ` Rik van Riel
2001-08-02 6:03 ` george anzinger
2001-08-02 14:39 ` Oliver Xymoron
2001-08-02 16:36 ` george anzinger
2001-08-02 17:05 ` Oliver Xymoron
2001-08-02 17:46 ` george anzinger
2001-08-02 18:41 ` Oliver Xymoron
2001-08-02 21:18 ` george anzinger
2001-08-02 22:09 ` Oliver Xymoron
2001-08-02 17:26 ` John Alvord
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