From: john stultz <johnstul@us.ibm.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca>,
"Martin J. Bligh" <mbligh@aracnet.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Increasing HZ (patch for HZ > 1000)
Date: 15 Dec 2003 19:04:14 -0800 [thread overview]
Message-ID: <1071543853.989.183.camel@cog.beaverton.ibm.com> (raw)
In-Reply-To: <20031212234028.GA541@elf.ucw.cz>
On Fri, 2003-12-12 at 15:40, Pavel Machek wrote:
> > For now, my patch only allows up to around 10 kHz. At that frequency, I
> > don't hear anything because the noise is not loud enough (ear is much
> > more sensitive at 1 kHz). Also, I have around 10% overhead on my
> > Pentium-M 1.6 GHz, so I guess it's not for everyone. Extrapolating from
> > there, I'd also say that at 100 kHz, it wouldn't do anything but handle
> > the interrupts, which is slightly annoying when you want to actually get
> > some work done :)
>
> I wonder what happens at 200kHz then; system might detect some lost
> ticks and keep running at very slow speed...
Indeed, with all the trouble HZ==1000 has caused, I'm thinking that
playing w/ HZ at 10k and 10 would be good stress tests for the time
subsystem.
I'd be interested in hearing how much drift people see when running w/
this patch.
thanks
-john
next prev parent reply other threads:[~2003-12-16 3:04 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-11 6:05 Increasing HZ (patch for HZ > 1000) Jean-Marc Valin
2003-12-11 7:07 ` Martin J. Bligh
2003-12-11 7:15 ` Jean-Marc Valin
2003-12-11 7:18 ` Martin J. Bligh
2003-12-11 17:18 ` Gene Heskett
2003-12-11 17:33 ` Martin J. Bligh
2003-12-11 18:10 ` Richard B. Johnson
2003-12-11 19:14 ` Gene Heskett
2003-12-11 18:35 ` Gene Heskett
2003-12-12 22:08 ` Pavel Machek
2003-12-12 22:57 ` Jean-Marc Valin
2003-12-12 23:18 ` Måns Rullgård
2003-12-12 23:40 ` Pavel Machek
2003-12-13 2:25 ` Måns Rullgård
2003-12-16 3:04 ` john stultz [this message]
2003-12-16 5:20 ` Mitchell Blank Jr
2003-12-14 1:05 ` bill davidsen
2003-12-14 4:48 ` Pat Erley
2003-12-11 7:30 ` Nick Piggin
2003-12-11 8:25 ` Tim Schmielau
2003-12-12 8:00 ` Jean-Marc Valin
2003-12-12 22:10 ` Pavel Machek
2003-12-12 22:50 ` Jean-Marc Valin
2004-01-03 18:16 ` Bill Davidsen
[not found] ` <010f01c415a4_27033d00_d100000a@sbs2003.local>
2004-04-06 13:00 ` Pavel Machek
2003-12-11 19:22 Grover, Andrew
2003-12-12 22:31 ` Jamie Lokier
2003-12-12 22:58 ` Vojtech Pavlik
2003-12-12 23:45 ` Jamie Lokier
2003-12-13 8:36 ` Vojtech Pavlik
2003-12-12 15:52 Vincent Legoll
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