So on an MP system, does Linux use the IOAPIC or the 8254 as the actual
timer tick source... ie... which device actually generates the timer ticks
(IRQ0)?
Best Wishes,
Lyle
>From: Chris Wedgwood <cw@f00f.org>
>To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
>CC: Lyle Coder <x_coder@hotmail.com>, linux-kernel@vger.rutgers.edu
>Subject: Re: IOAPIC and 8254
>Date: Fri, 3 Mar 2000 09:12:05 +1300
>
>On Thu, Mar 02, 2000 at 07:55:29PM +0100, Maciej W. Rozycki wrote:
>
> > As a source of the system time tick. We could probably use the RTC
> > periodic interrupt instead, but HZ got fixed at 100 on i386 long time
>ago
> > and the best approximation we can get from the RTC is 128 ;-) as it only
> > allows powers of 2. Alphas use 1024 for HZ so they do not suffer from
> > this problem.
>
>I theory, it should be pretty safe to change the default value of HZ
>except many userspace programs probably 100 as an assumption and may
>give funny results.
>
>People do increase HZ to much higher values (10000?) to be better
>control over some kernel features such as CBQ.
>
>
>-cw
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