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From: Mitchell Blank Jr <mitch@sfgoth.com>
To: john stultz <johnstul@us.ibm.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Increasing HZ (patch for HZ > 1000)
Date: Mon, 15 Dec 2003 21:20:34 -0800	[thread overview]
Message-ID: <20031216052034.GI70731@gaz.sfgoth.com> (raw)
In-Reply-To: <1071543853.989.183.camel@cog.beaverton.ibm.com>

john stultz wrote:
> 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 think setting HZ much lower than 100 might break some drivers that
do things like:
		timeout = jiffies + (HZ / 50);

Not sure if any of the common drivers have this problem but be on the
lookout for it if you want to try running w/ really low HZ.

I suppose there should really be a "FRACTION_OF_SECOND()" macro or something
that always returns >0 for specifying these really short delays.

-Mitch

  reply	other threads:[~2003-12-16  5:19 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
2003-12-16  5:20               ` Mitchell Blank Jr [this message]
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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