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From: Andi Kleen <ak@suse.de>
To: "Dong Feng" <middle.fengdong@gmail.com>
Cc: "Jeremy Fitzhardinge" <jeremy@goop.org>, linux-kernel@vger.kernel.org
Subject: Re: Timer Selection
Date: Sun, 10 Sep 2006 15:51:11 +0200	[thread overview]
Message-ID: <200609101551.11521.ak@suse.de> (raw)
In-Reply-To: <a2ebde260609100334v65bf5e4fx754e3b00576bfb9f@mail.gmail.com>

On Sunday 10 September 2006 12:34, Dong Feng wrote:
> In i386 architecture, there are five timers as candidates in the selection
> of "cur_timer." I feel among the five only two types can be used as Kernel
> base timer, HPET and PIT. Kernel base timer is the timer trigger
> timer_interrupt() periodically. Namely, the timer installed on IRQ 0 in
> i386 architecture.
>
> Is the above understanding correct? Particularly I want to confirm which
> timers can be used as Kernel base timer.

Only HPET and PIT can be interrupt 0 in the PC architecture
(HPET only if the legacy option is available), but there is no reason 
the main timer handler cannot be driven from another interval timer (e.g. 
x86-64 offers the APIC timer as a option for this)

-Andi

  parent reply	other threads:[~2006-09-10 13:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <a2ebde260609100334v65bf5e4fx754e3b00576bfb9f@mail.gmail.com>
2006-09-10 10:37 ` Timer Selection Dong Feng
2006-09-10 13:51 ` Andi Kleen [this message]
2006-09-10 14:23   ` Dong Feng

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