From: Vojtech Pavlik <vojtech@suse.cz>
To: Jamie Lokier <jamie@shareable.org>
Cc: Vojtech Pavlik <vojtech@suse.cz>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
linux-kernel@vger.kernel.org, torvalds@osdl.org, "Nakajima,
Jun" <jun.nakajima@intel.com>,
"Mallick, Asit K" <asit.k.mallick@intel.com>
Subject: Re: [PATCH][2.6][5/5]Support for HPET based timer
Date: Wed, 20 Aug 2003 10:03:41 +0200 [thread overview]
Message-ID: <20030820080341.GA17793@ucw.cz> (raw)
In-Reply-To: <20030820000856.GE18035@mail.jlokier.co.uk>
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
next prev parent reply other threads:[~2003-08-20 8:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-19 19:20 [PATCH][2.6][5/5]Support for HPET based timer Pallipadi, Venkatesh
2003-08-19 22:41 ` Vojtech Pavlik
2003-08-20 0:08 ` Jamie Lokier
2003-08-20 8:03 ` Vojtech Pavlik [this message]
[not found] <mmGp.wp.3@gated-at.bofh.it>
[not found] ` <mnsM.1eL.13@gated-at.bofh.it>
[not found] ` <moRP.2r8.11@gated-at.bofh.it>
2003-08-20 0:31 ` Andi Kleen
2003-08-20 1:04 ` Jamie Lokier
2003-08-20 8:05 ` Vojtech Pavlik
-- strict thread matches above, loose matches on Subject: below --
2003-08-20 1:28 Pallipadi, Venkatesh
2003-08-20 8:10 ` Vojtech Pavlik
2003-08-20 17:51 Pallipadi, Venkatesh
2003-08-21 8:25 ` Vojtech Pavlik
2003-08-21 20:56 Pallipadi, Venkatesh
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