Date: Tue, 27 May 2003 19:42:46 +0000
From: Arjan van de Ven <arjanv@redhat.com>
To: Daniele <dandario@libero.it>
Cc: Arjan van de Ven <arjanv@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: [RFC] HZ entry in /proc/sys/kernel
Message-ID: <20030527194246.E32598@devserv.devel.redhat.com>
References: <1053950030.2028.4.camel@nalesnik.localhost> <1053951356.32566.3.camel@laptop.fenrus.com> <20030527193957.GA288@libero.it>
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In-Reply-To: <20030527193957.GA288@libero.it>; from dandario@libero.it on Tue, May 27, 2003 at 09:39:57PM +0200
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On Tue, May 27, 2003 at 09:39:57PM +0200, Daniele wrote:
> On Mon, May 26, 2003 at 02:15:57PM +0200, Arjan van de Ven wrote:
> > On Mon, 2003-05-26 at 13:53, Grzegorz Jaskiewicz wrote:
> > > I have seen few scripts allready that are assuming HZ==100.
> > > Afaik this value is different in 2.5/2.4 for the same arch.
> > 
> > No it's not actually.
> > The userspace interface is constant/stable and in units of HZ=100 even
> > though the kernel HZ might be different.
> > 
> 
> What's this HZ value related to?

the userspace interface is not in units of kernel HZ, but in
"theoretical time units that happen to match a defined
default" which happens to match 10ms on x86.

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