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From: Ingo Molnar <mingo@elte.hu>
To: Daniel Walker <dwalker@mvista.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: 2.6.20-rc6-mm3
Date: Tue, 6 Feb 2007 22:09:59 +0100 [thread overview]
Message-ID: <20070206210959.GC25430@elte.hu> (raw)
In-Reply-To: <1170795378.3455.31.camel@dwalker1>
* Daniel Walker <dwalker@mvista.com> wrote:
> > it's quite easy to explain: because of the new dynticks feature.
> > Both 'timer' and 'LOC' counts go way down.
>
> I don't have that enabled tho .. This is with HRT/dynamic tick both
> off..
your kernel utilizes the kernelin a more optimal way: the new
clockevents code now utilizes the local APIC timer irq (represented by
the LOC field) for periodic interrupts. The local APIC timer irq has a
cost of ~2 usecs per IRQ, while the PIT irq is ~10 usecs per irq. With
HZ=1000 this means savings of ~8000 usecs per second - i.e. 8 msecs per
second, which is 0.8% more raw CPU power available - which isnt that
bad.
we could make this clearer by renaming 'LOC' (which stands for 'LOCal
timer interupts' and was added [and misnamed] by yours truly many moons
ago) to 'apic-timer' and 'timer' to 'PIT-timer' but /that/ would be more
of a userspace visible change than the change in the counter rates.
Ingo
next prev parent reply other threads:[~2007-02-06 21:10 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-30 4:45 2.6.20-rc6-mm3 Andrew Morton
2007-01-30 4:50 ` 2.6.20-rc6-mm3 Jeff Garzik
2007-01-30 5:11 ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-30 9:56 ` 2.6.20-rc6-mm3 Evgeniy Polyakov
2007-01-30 8:16 ` 2.6.20-rc6-mm3 Sunil Naidu
2007-01-30 8:32 ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-30 9:06 ` 2.6.20-rc6-mm3 Olivier Galibert
2007-01-30 9:26 ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-30 18:47 ` 2.6.20-rc6-mm3 Olivier Galibert
2007-01-31 7:57 ` 2.6.20-rc6-mm3 Len Brown
2007-02-01 4:25 ` 2.6.20-rc6-mm3 Len Brown
2007-01-30 22:18 ` 2.6.20-rc6-mm3 Maciej Rutecki
2007-01-30 22:27 ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-31 0:55 ` 2.6.20-rc6-mm3 Karsten Wiese
2007-01-31 13:22 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-01-31 14:25 ` 2.6.20-rc6-mm3 Karsten Wiese
2007-02-01 8:01 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-01 10:44 ` 2.6.20-rc6-mm3 Karsten Wiese
2007-03-01 11:11 ` 2.6.20-rc6-mm3 Karsten Wiese
2007-02-03 0:37 ` 2.6.20-rc6-mm3 Pavel Machek
2007-02-01 13:03 ` [PATCH -mm] gtod persistent clock resume fix Thomas Gleixner
2007-01-31 11:54 ` 2.6.20-rc6-mm3 Maciej Rutecki
2007-02-01 4:10 ` 2.6.20-rc6-mm3 Len Brown
2007-02-01 4:17 ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-31 1:16 ` 2.6.20-rc6-mm3 Tilman Schmidt
2007-01-31 1:25 ` 2.6.20-rc6-mm3 Andrew Morton
2007-01-31 11:38 ` 2.6.20-rc6-mm3 Tilman Schmidt
2007-01-31 12:29 ` 2.6.20-rc6-mm3 Alexey Starikovskiy
2007-01-31 16:02 ` 2.6.20-rc6-mm3 Maciej Rutecki
2007-01-31 18:28 ` 2.6.20-rc6-mm3 Tilman Schmidt
2007-01-31 21:52 ` 2.6.20-rc6-mm3 Mattia Dongili
2007-01-31 23:21 ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01 19:04 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-01 19:36 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-01 20:01 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-01 21:11 ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01 22:33 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-02 19:18 ` dynticks + iptables almost stops the boot process [was: Re: 2.6.20-rc6-mm3] Mattia Dongili
2007-02-02 20:27 ` Thomas Gleixner
2007-02-02 20:43 ` Mattia Dongili
2007-02-06 16:48 ` Ingo Molnar
2007-02-06 19:28 ` Mattia Dongili
2007-02-06 23:12 ` Tilman Schmidt
2007-02-06 23:17 ` Thomas Gleixner
2007-02-07 1:01 ` Andrew Morton
2007-02-07 19:33 ` Ingo Molnar
2007-02-01 21:37 ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01 20:24 ` 2.6.20-rc6-mm3 Mattia Dongili
2007-02-01 0:14 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01 0:24 ` 2.6.20-rc6-mm3 Andrew Morton
2007-02-01 0:27 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01 0:36 ` 2.6.20-rc6-mm3 Andrew Morton
2007-02-01 0:38 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01 6:20 ` 2.6.20-rc6-mm3 David Chinner
2007-02-01 7:12 ` 2.6.20-rc6-mm3 Andrew Morton
2007-02-01 19:01 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01 19:18 ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-01 20:18 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-01 20:26 ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-01 23:02 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-05 12:02 ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-05 12:17 ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-05 12:56 ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-05 18:20 ` 2.6.20-rc6-mm3 Christoph Lameter
2007-02-05 18:34 ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-02 4:08 ` 2.6.20-rc6-mm3 David Chinner
2007-02-02 7:31 ` 2.6.20-rc6-mm3 Jens Axboe
2007-02-01 18:24 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-01 19:37 ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-01 20:29 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-01 20:38 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-02 14:22 ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-02 14:47 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-02 14:50 ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-02 16:04 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-03 7:30 ` 2.6.20-rc6-mm3 Cedric Le Goater
2007-02-03 7:57 ` 2.6.20-rc6-mm3 Starikovskiy, Alexey Y
2007-02-02 17:39 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 16:03 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 18:36 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 18:45 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 19:07 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 19:55 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 20:20 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 20:40 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 20:52 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 20:56 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 21:09 ` Ingo Molnar [this message]
2007-02-06 21:20 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 21:23 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 21:41 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 21:54 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 22:08 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 22:42 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 22:56 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 23:04 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:14 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 23:22 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:28 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 23:35 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:44 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 23:51 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-07 2:46 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:36 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-07 1:12 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-07 14:53 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 23:37 ` 2.6.20-rc6-mm3 Ingo Molnar
2007-02-06 22:13 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 21:43 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 21:59 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 21:17 ` 2.6.20-rc6-mm3 Thomas Gleixner
2007-02-06 21:25 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:15 ` 2.6.20-rc6-mm3 Rob Landley
2007-02-06 23:28 ` 2.6.20-rc6-mm3 Daniel Walker
2007-02-06 23:55 ` 2.6.20-rc6-mm3 Rob Landley
2007-02-06 22:11 ` [-mm patch] #ifdef ACPI_FUTURE_USAGE acpi_os_readable() Adrian Bunk
2007-02-06 22:12 ` [RFC: -mm patch] drivers/net/atl1/: possible cleanups Adrian Bunk
2007-02-07 0:19 ` Jay Cliburn
2007-02-07 0:22 ` Jeff Garzik
2007-02-07 0:24 ` J. K. Cliburn
2007-02-07 0:24 ` Adrian Bunk
2007-02-06 22:12 ` [-mm patch] drivers/scsi/aacraid/: cleanups Adrian Bunk
2007-02-06 22:12 ` [-mm patch] make gfs2_writepages() static Adrian Bunk
2007-02-07 10:50 ` Steven Whitehouse
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