From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
To: Tony Lindgren <tony@atomide.com>
Cc: Con Kolivas <kernel@kolivas.org>, Adrian Bunk <bunk@stusta.de>,
linux-kernel@vger.kernel.org, ck@vds.kolivas.org,
tuukka.tikkanen@elektrobit.com, george@mvista.com,
Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 5
Date: Mon, 8 Aug 2005 20:36:56 +0530 [thread overview]
Message-ID: <20050808150656.GA16993@in.ibm.com> (raw)
In-Reply-To: <20050808073822.GF28070@atomide.com>
On Mon, Aug 08, 2005 at 12:38:23AM -0700, Tony Lindgren wrote:
> It should not matter when the PIT gets reprogrammed, as the system time is
> not updated from PIT timer. Jiffies are calculated from a second timer, such
> as ACPI PM timer or TSC.
I am more worried about timer latencies and its effects. Because of this skew
between when jiffy interrupt was originally supposed to happen and when it
will now happen, it can lead to, for example, scheduling latencies upto
1 jiffy (for HZ=100, that could hurt some apps?) Not to mention that
this will not play well with high-res-timers, but that is probably
not a concern now!
--
Thanks and Regards,
Srivatsa Vaddagiri,
Linux Technology Center,
IBM Software Labs,
Bangalore, INDIA - 560017
next prev parent reply other threads:[~2005-08-08 15:06 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-03 5:59 [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3 Con Kolivas
2005-08-03 11:54 ` Jan De Luyck
2005-08-03 12:14 ` Con Kolivas
2005-08-03 14:23 ` Jan De Luyck
2005-08-04 15:03 ` Vojtech Pavlik
2005-08-05 5:12 ` Con Kolivas
2005-08-03 19:20 ` Jim MacBaine
2005-08-03 21:16 ` Con Kolivas
2005-08-03 22:22 ` Jim MacBaine
2005-08-03 22:52 ` Con Kolivas
2005-08-04 5:34 ` Jim MacBaine
2005-08-04 6:59 ` Jim MacBaine
2005-08-04 7:04 ` Con Kolivas
2005-08-04 7:12 ` Con Kolivas
2005-08-04 7:29 ` Tony Lindgren
2005-08-10 20:04 ` Bill Davidsen
2005-08-14 19:47 ` Pavel Machek
2005-08-15 1:43 ` Zwane Mwaikambo
2005-08-15 12:52 ` Con Kolivas
2005-08-15 15:39 ` Zwane Mwaikambo
2005-08-03 19:54 ` Jeffrey Hundstad
2005-08-03 20:07 ` Valdis.Kletnieks
2005-08-03 21:13 ` Con Kolivas
2005-08-03 23:22 ` Christian Leber
2005-08-04 16:25 ` Marc Ballarin
2005-08-04 5:09 ` Jan De Luyck
2005-08-04 5:07 ` Con Kolivas
2005-08-04 5:34 ` Jan De Luyck
2005-08-04 21:15 ` [PATCH] Timer Top was: " Daniel Petrini
2005-08-05 4:05 ` [PATCH] Timer Top tweaks Con Kolivas
2005-08-05 6:46 ` [ck] [PATCH] Timer Top was: i386 No-Idle-Hz aka Dynamic-Ticks 3 Jens Axboe
2005-08-05 12:39 ` Daniel Petrini
2005-08-05 13:55 ` Daniel Petrini
2005-08-04 21:44 ` [PATCH] " Adrian Bunk
2005-08-04 22:12 ` Marc Ballarin
2005-08-05 0:31 ` Con Kolivas
2005-08-05 1:30 ` Paul
2005-08-05 3:25 ` Con Kolivas
2005-08-05 12:37 ` Srivatsa Vaddagiri
2005-08-05 13:08 ` Con Kolivas
2005-08-05 16:39 ` [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 4 Con Kolivas
2005-08-06 17:47 ` Adrian Bunk
2005-08-07 5:12 ` [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 5 Con Kolivas
2005-08-07 16:58 ` Srivatsa Vaddagiri
2005-08-07 23:51 ` Con Kolivas
2005-08-08 1:20 ` Kyle Moffett
2005-08-08 1:30 ` Con Kolivas
2005-08-08 1:45 ` [ck] " Gabriel Devenyi
2005-08-08 2:44 ` Srivatsa Vaddagiri
2005-08-08 7:05 ` Nigel Cunningham
2005-08-08 7:38 ` Tony Lindgren
2005-08-08 15:06 ` Srivatsa Vaddagiri [this message]
2005-08-09 19:36 ` George Anzinger
2005-08-10 14:05 ` Srivatsa Vaddagiri
2005-08-10 22:37 ` George Anzinger
2005-08-11 21:33 ` Bill Davidsen
2005-08-12 15:13 ` George Anzinger
2005-08-08 15:08 ` Folkert van Heusden
2005-08-08 15:16 ` Daniel Petrini
2005-08-08 7:26 ` [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 3 Tony Lindgren
2005-08-08 14:54 ` Srivatsa Vaddagiri
2005-08-08 15:20 ` Tony Lindgren
2005-08-09 14:22 ` Zwane Mwaikambo
2005-08-10 7:46 ` Tony Lindgren
2005-08-09 20:05 ` George Anzinger
2005-08-09 20:22 ` Daniel Petrini
2005-08-10 8:02 ` Tony Lindgren
2005-08-10 22:40 ` George Anzinger
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