lkml.org 
[lkml]   [2003]   [Aug]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH][2.6][5/5]Support for HPET based timer
On Wed, Aug 20, 2003 at 01:08:56AM +0100, Jamie Lokier wrote:
> Vojtech Pavlik wrote:
> > On Tue, Aug 19, 2003 at 12:20:22PM -0700, Pallipadi, Venkatesh wrote:
> >
> > > 5/5 - hpet5.patch - This can be a standalone patch. Without this
> > > patch we loose interrupt generation capability
> > > of RTC (/dev/rtc), due to HPET. With this patch
> > > we basically try to emulate RTC interrupt
> > > functions in software using HPET counter 1.
> > >
> >
> > This is very wrong IMO. We shouldn't try to emulate the RTC interrupt
> > for the kernel, instead the HPET should use native APIC interrupt
> > routing.
>
> Even on those machines where APIC interrupts are not usable?
> (E.g. due to interactions with the SMM BIOS).

Well, I suspect the machines with HPET should better have usable APIC
interrupts, because you won't be able to use all the HPET timers then -
only two can be routed via the timer and RTC interrupts, the other need
to use APIC or direct FSB delivery.

--
Vojtech Pavlik
SuSE Labs, SuSE CR
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:47    [W:0.055 / U:4.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site