linux-kernel - Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

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Message-ID: <20061114180421.GA1910@rhlx01.hs-esslingen.de>
Date:	Tue, 14 Nov 2006 19:04:21 +0100
From:	Andreas Mohr <andi@...x01.fht-esslingen.de>
To:	Andreas Mohr <andi@...x01.fht-esslingen.de>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
Subject: Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

On Tue, Nov 14, 2006 at 06:30:54PM +0100, Andreas Mohr wrote:
> Hmm, hopefully it's easy to research where to enable HPET
> (if there is one at all!) on an el-cheapo VIA chipset...

http://forum.insanelymac.com/index.php?showtopic=31399&pid=219051&st=0&#entry219051
"The VIA VT8237 chipset also support HPET."

And this is confirmed by:

http://www.nabble.com/-PATCH--HPET:-do-not-use-64-bit-reads-t2500136.html
"However, there is no guarantee that the timer actually has 64 bits, the
specification only recommends it.  My x86-64 system has a 32-bit timer
(AMD64 with a VT8237 southbridge). "

Hmm, and I'm afraid I have a VT8235 only which possibly doesn't have HPET :-P

A relatively detailed (covers Windows XP timer details) HPET etc.
x86 timers discussion is at
"[Comp-arch] x86 High Precision Event Timers support"
https://www.gelato.unsw.edu.au/archives/comp-arch/2006-June/001320.html

Andreas Mohr
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