From: root <mbs@mc.com>
To: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: David Schleef <ds@schleef.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>, 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 09:35:37 -0400 [thread overview]
Message-ID: <3AD30C29.3E8D47A0@mc.com> (raw)
In-Reply-To: <Pine.LNX.3.96.1010410155723.28395A-100000@artax.karlin.mff.cuni.cz>
Mikulas Patocka wrote:
> BTW. Why we need to redesign timers at all? The cost of timer interrupt
> each 1/100 second is nearly zero (1000 instances on S/390 VM is not common
> case - it is not reasonable to degradate performance of timers because of
> this).
>
> Timers more precise than 100HZ aren't probably needed - as MIN_RTO is 0.2s
> and MIN_DELACK is 0.04s, TCP would hardly benefit from them.
>
well, I can think dozens of real time applications off the top of my head that
need beter than 1ms timing resolution (think sensor fusion) 1000 clock
interrupts/sec is wasteful when what you need is 1 very precisely timed
interrupt.
why do we redesign anything? to make it better. TCP is not the only thing in
the system.
if you are in love with the existing system, it shouldn't be hard to make it a
config option.
next prev parent reply other threads:[~2001-04-10 14:29 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 [this message]
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
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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